目录

RabinKarp算法

1，思路

2，V1代码（不解决冲突）

3，V2代码（解决冲突）

4，V3代码（解决冲突）

5，V4代码（双哈希，不解决冲突）

力扣 1044. 最长重复子串​

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RabinKarp算法

1，思路

把子串映射到整数，哈希函数就是进制数。

利用滑动窗口的方式，快速计算所有子串的哈希值。

需要解决哈希冲突。

2，V1代码（不解决冲突）

 class Basic {public:static char MinValue(char){return 'a';}static int MinValue(int){return 0;}static int ValueNum(char) {return 26;}static int ValueNum(int) {return 10;}};
class RabinKarp :public Basic {
public:static string getFirstSameSubStr(string s, int len){vector<int> v = getStrHash(s, len);map<int, int>m;for (int i = 0; i < v.size(); i++) {if (m[v[i]]) {return s.substr(i, len);}m[v[i]]=1;}return "";}
private:static vector<int> getStrHash(string s, int len)//获取所有长为len的子串的哈希值，有哈希冲突{vector<int>ans;if (s.length() < len)return ans;long long x = 0, c = 1, p = 1000000007, n = ValueNum(s[0]);for (int i = 0; i < len; i++) {x = (x* n + getValue(s[i])) % p, c = c * n % p;}ans.push_back(x);for (int i = len; i < s.length(); i++) {x = (x*n + p - getValue(s[i - len])*c%p + getValue(s[i])) % p;ans.push_back(x);}return ans;}static inline int getValue(char c){return c - MinValue(c); //根据实际情况定制MinValue}
};

测试代码（参见下面的​ 力扣 1044. 最长重复子串​）：

template<typename T>
class Bsearch { //寻找[low,high]中最小的满足Ok条件的数，low<=high,返回值范围是[low,high+1]
public:T find(T low, T high){if (!isOk(high))return high + 1;if (isOk(low))return low;T mid;while (high - low > getGap(low)) {mid = (high + low) / 2;if (isOk(mid))high = mid;else low = mid;}return high;}
private:virtual bool isOk(T x){return x > 0;}int getGap(int) {return 1;}int getGap(long long) {return 1;}double getGap(double) {return 0.00001;}
};class Solution: public Bsearch<int> {
public:string longestDupSubstring(string s) {this->s = s;int len = find(1, s.length() - 1);return GetFirstSameSubStr(s, len - 1);}bool isOk(int x){string ss = GetFirstSameSubStr(s, x);return ss == "";}string s;
};

有BUG的例子：

string str = "dcecccaedebdcedcbaaddbbdbccbcbdcecbddaaedecbeccdeabdceebcaaeccbbcdcdaceceeacedadcdddbbbaedeaebbbecbeebdcdebadabaecacdeeeabeaaaeacbdacedabbadcbeddebbbcebedeecdbebbdbcebacebdaaceabdbdcaebddeaeccaccbcebdacddbdddbadecbadaacaadcdececadeebbacedebeddcaacedacbcaadecdeecddbdbbbcccedeaaeecededdaccddbdccdcdddddcdacceabbcebdebddbcbbaaababceebdaaeababeacaeddccecadebeceeddaddbdbdebcbceceeacedcaedcebeeeadbbecdecaeabaeedbdddaececeebcaddbcaaeebcbeccbedcdeccebeebdbaceddebddabebbabbcedbbedacecbaebaaedbeaeaebbaaeeeebbbbeecdecdcedbcdbbbdcaecdbbcadbeebaebcaebccadecdccabbddbddeaeeaecccbeacdcbeadadadacbceaaeceebcdcddceeebebedececacadbedeeebdecadbebebebecaeeecbdceecdcacadceadcceaebcbaceeceeaaedecaddbaacacdbedebeeccadbccdeccdcadcdaadbabddbbdaacbaaaceeecaadcabadbeecadeebbdcebabedcddbebdcbaccdaabebcbacbedadeacbbcacadbdabbaccadadddeabdcbbdeacdbeededdecebceacabdceaeaaeaacbbbacabccedddeceadceedacccedaaceadeabccbdaeadcabbccadaecddebbadeecadccbacebdaabbeacdccaedeeeaaadaaaddebeadcbbdcebeeaebecdbacccbaeadcbacabbbeedeaaccaebddaaceadebeedebabdbbecebeabddeeecaeedddabacbbdbddebbadadcbeacecdaabcaeddceebceebaecccadeecbbdbeaeedcdeaabadcdeaebaaaadbdadeeaadadcabeceadbbdedadaaaecdacdbcedbeabcbeaeacaecebdeaedacbcbeaebcabdaabaddecadbeaecdcbebbbccbbddbccdebaaeecccddaaeccedebabacdeecbbbbccdedcbcebeceedcaacbeaacabdbbeeebdcddbceebdaddacadadceaaeecabaecadcdabbccaabcdbeededadcbecbebcdceabccecbebbbccbcddccebdeacbebabeecbebacceecbdddeeeeabeaabcdbecbbdacdccadbeeaccecdbcddcdacbaddcacdacdbebeaabdadeaadcacedcccdcdbddaaebacecbdccdbaabdecadddedcbbaaacdeaddcdcebcaeccbcbcdaaeceabaedeeeadebcaadbbedbccbaabdbdccbabceabeeccbbadbaecedddccedaeaabcbaaeabcdbdbdaabcedbbbdbeabaedcbdabeeabbadecadeadabcbdaebdbcbecccaaeadcaaebcccdacabdbecebbedaaeebcadbeeeebebccdaceedecdedceaceaeabccbebaccebdceabbdadcdccbeeebbbbaedebecbbbeabebdabdcdcbcbedaedcbcaebbccdbacdccbbcbadcbbaccbebaaabaaaedccdceecababeacddacceeabeaabaaeccceccecddeecdadedeaadabaccabbadaaecbebccbabaadcbecebedbaececeabdebcadaddcaebeeabbebedeadcdccbadabcecbacecbdbccebcbbaadceadbacadeeebcddcdddccaeaababdcddeebaaddcbcaaddceedacdaaeaadcedeeaeaddebdabaddddbadccbdbebcecdccebeebdcccbeedbcceebbadcdebaeedbecccdbaedcdbcbbaaaaabbbdaddabdbbeebdeabedededbdbcecedadbaebddcabbbabecacdedccbeaacaeaccadcbeebaadceddbdacbbadccacbadcdddabcccaababebdceeddcaebbaebeeedabdbcacabdcbaceabcccdcacacbbaeeaaddedaabccaabbeaccaceecbaacbeebcbeaecdbcaeaaaedcdbebcaaaaacaabbbbccbceebbbaaaceccabdeceeeddbabadddeeaaebbabbeaadaacacdebbaadbaeebbdebbabbbbbeadbebadacdcdbaccaebaadccbabcadccbeaacadeabcadebbcadabaaaaeccaddbbebcdabdededddeadcbceacebaeeddeaebedbebaeabebcadcdbccdbdbdeccaebddeaabccdaecebdededddcbbcacdcbaedcebdedaaceebccbcdababaeaacabcddaadacaadbadcdbbedaebddebedceddddceadeaebbebbaabdeabdcdabccdcedaddeaeddecdecbeebeedaadbcbbebcbeecedaabcacaabdbaecaeebeaedadbabecbaabbebadaccadeebeeebbecdcaecaeacadeabbadceaeccbcdbebaaabebaacdebbcaaeadccbebcebebebbedddacbbccbedbecbeaebecedacdcdbbebdaedeabcabaaaeebbdbbaddadcebbacecbaacddecbddeecbbedecedbbaebddeeacbcdedbdaddbbaecdccaedcebeeebaacaaabcbddccacbccbacdbebaeadbeaacacbceddbaeabaaaadaabbcddaabcabeeccabcebacdacbadbdebddaddeaabeebbbbbbacbdddecbaddcdeaaaeecbbcedcbecddbebeccaacaedabdacabdaabdbadccddedecdebadcdcadbedeecbdddaacdbdcadddacaedceacaecaebcecedeaeadbabccdbdeacebaccaabccccdcecaecadeaddeaeddabcbadedceebdaacdadebbeebdeedcecebdeecaaeccbcdddddadbbbcbaabccabebabdcdcaacadaaeebbbedbdecabcceeccabadbbaddcdbeaaeeadaddeebaecaedecccaadbdeddbbbeeceeaaccaedadddbaecacccadaeecdecabccabbebcacedbeadccddeaadacdcbeedeaeabcbccbbdcdaeedbcabaaccaccbdaacebacaecdacbebddbbbdddebacadaaadbdcbcaccdddeedbecbcdcbaeaacbabbeaeebbadadaebbccaebebdeeceecbabdebcebeaadebdbbddcaeddbcadeadaabdccdecdcaccaecccdeaaacdbdccadacbdbaaccdbddbecaacbcbbdbedecedecbaacadccaedbacabddaeccdecaaeeecadddeaaadcdaedeadedbeeccccabeadaebcaaecacebdcdaaadedccacdceaeededcaaedceccedccebdacbececeeaebaecbdeecdbaeeeeeadececcdcabbddadecdddabdeeedccabbaebddedecccacdbdcbbcddcaecbdaddcadacbbccceccecacddcbaedcbbeecedbeecdeaaeeeecdcabcebecbcebbceabaddeacaedaabadebcecdadbebcbbeeaceaacbdcaabacadaebebcdceeeacaacaddeaadabaceeecbccbecbdabebebccdadeedaadaecceacaabeacdaebeecbdcbbdeddbeebdadbabbeaddbcdccdbcebddaebeddcaecdededebebdaabdddaecedddabbeeebadbbbdebeeecbbebaebdeebceaeaedbecbbcadadbeacceeecbabaeadbdedccbbbbaabeabbbdadceedaaddcbbceadbbaebebebbdeadcaabdeebaaebbeecaddecccbddcdebadcebbaacddbbeecadbcaebdebaaeeaadbaeeeedbcabebceccebabbeebcddebcdbdabcbcbbcadecbdacedadacdbbebeebaddecbccaeaeccedbcddededdecbcecdeaabeceeadbcbeaaccaeccceadecaaacbaaccaccbeeeceddadaabdeeaedbcceabeabbbcaeededdcdcbdbbedecbbdbeeeccadcadedeacbbcdbebcbeaedbcbdbdabbdcacacadeedbebddeddccaeebceddeeebdbbabcaebdbdbedeeadbabaadddcaabbbbcabeeddbbadabacceabcbceddeceadcdbaeadaedebecdecbdbabdcacddbccbaedcceabbecabdacbdcbaeaeccceecabbaeaecdeadabaeeedeeadeebbacdaceadedecedebbbcbaccaacebbebadaeaecbeebadaaceaabebdbddeecedcbcbcdbcdaccacbbbdaddacbcaaaebdcadbcaeeaacacebeebaeeecbdeedddcebcbeaabdedbaddabcadbbaeadccdbcebddadebaaabcaeadcedaadcaeedcbbcdbcdbcdcbdcebaaadededdccebebbedcadeadeeadeebbdceebdddacebdedbbcdabbcdacbbdcccacdbacbbaeeeacbedceaedebbacdbeebaebbaeacaccaecdeacbbaacaceebedaacdcebaaacadcdeceaeeadcadceaeeabeecaabbabbebdecdcadadebabddbabebdbadeabcdadbbcaadcdbdbabddebcbcbeddabbcabaebcbccddbbbbebdbdabcdcddbdbceecadbadadbdcbadedecdcbaebcaaddbeebceaceeaacceabcacaccddcebcabbebddecddbedbddaeadebbcdccddeebebbaceaaeeebcdceeebdccbaababcdcbdcebbbbcaeccecaadcaeabababbcdaeaecdcbaddbacbaeecdcdecccabcddbbbcdcadadabcbcedaadaacceaededbaecaeadabdcd";

哈希冲突在于这2个字符串：

dacbececeeaebaecbdeecdbaeeeeeadececcdcabbddadecdddabdeeedccabbaebddedecccacdbdcbbcddc
dcedaddeaeddecdecbeebeedaadbcbbebcbeecedaabcacaabdbaecaeebeaedadbabecbaabbebadaccadee

3，V2代码（解决冲突）

class RabinKarp :public Basic {
public:static string getFirstSameSubStr(string s, int len){vector<int> v = getStrHash(s, len);map<int, vector<int>>m;for (int i = 0; i < v.size(); i++) {if (!m[v[i]].empty()) { // 处理哈希冲突,性能还可以提升string s1 = s.substr(i, len);for (auto k : m[v[i]]) { string s2 = s.substr(k, len);if (s1 == s2)return s1;}}m[v[i]].push_back(i);}return "";}
private:static vector<int> getStrHash(string s, int len)//获取所有长为len的子串的哈希值，有哈希冲突{vector<int>ans;if (s.length() < len)return ans;long long x = 0, c = 1, p = 1000000007, n = ValueNum(s[0]);for (int i = 0; i < len; i++) {x = (x* n + getValue(s[i])) % p, c = c * n % p;}ans.push_back(x);for (int i = len; i < s.length(); i++) {x = (x*n + p - getValue(s[i - len])*c%p + getValue(s[i])) % p;ans.push_back(x);}return ans;}static inline int getValue(char c){return c - MinValue(c); //根据实际情况定制MinValue}
};

感觉substr调用次数可能比较多，有重复运算，性能还可以提升。

测试数据：

 string str = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb"
"ccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccdddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee"
"fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffgggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggghhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh"
"iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiijjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkklllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm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耗时161毫秒

4，V3代码（解决冲突）

class RabinKarp :public Basic {
public:static string getFirstSameSubStr(string s, int len){vector<int> v = getStrHash(s, len);map<int, vector<int>>m;map<int, vector<string>>ms;for (int i = 0; i < v.size(); i++) {if (!m[v[i]].empty()) { // 处理哈希冲突if (ms[v[i]].empty())ms[v[i]].push_back(s.substr(m[v[i]][0], len));string s1 = s.substr(i, len);for (auto &s2 : ms[v[i]]) {if (s1 == s2)return s1;}ms[v[i]].push_back(s1);}m[v[i]].push_back(i);}return "";}
private:static vector<int> getStrHash(string s, int len)//获取所有长为len的子串的哈希值，有哈希冲突{vector<int>ans;if (s.length() < len)return ans;long long x = 0, c = 1, p = 1000000007, n = ValueNum(s[0]);for (int i = 0; i < len; i++) {x = (x* n + getValue(s[i])) % p, c = c * n % p;}ans.push_back(x);for (int i = len; i < s.length(); i++) {x = (x*n + p - getValue(s[i - len])*c%p + getValue(s[i])) % p;ans.push_back(x);}return ans;}static inline int getValue(char c){return c - MinValue(c); //根据实际情况定制MinValue}
};

耗时144毫秒

5，V4代码（双哈希，不解决冲突）

利用双哈希降低冲突概率，不解决冲突。

同时对上面的极限用例（即连续1000个相同字符）做了针对性优化。

class RabinKarp :public Basic {
public:static string getFirstSameSubStr(string s, int len){bool flag;vector<pair<int, int>> v = getStrHash(s, len, flag);if(flag)return s.substr(v.size(), len);map<pair<int, int>, int>m;for (int i = 0; i < v.size(); i++) {if(m[v[i]])return s.substr(i, len);m[v[i]] = 1;}return "";}
private:static vector<pair<int,int>> getStrHash(string s, int len, bool &flag)//获取所有长为len的子串的双哈希值{flag = false;vector<pair<int, int>>ans;if (s.length() < len)return ans;long long x1 = 0, x2 = 0, c1 = 1, c2 = 1, p = 1000000007, n1 = ValueNum(s[0]), n2 = 49999;for (int i = 0; i < len; i++) {x1 = (x1 * n1 + getValue(s[i])) % p, c1 = c1 * n1 % p;x2 = (x2 * n2 + getValue(s[i])) % p, c2 = c2 * n2 % p;}ans.push_back(make_pair(int(x1), int(x2)));for (int i = len; i < s.length(); i++) {x1 = (x1 * n1 + p - getValue(s[i - len]) * c1 % p + getValue(s[i])) % p;x2 = (x2 * n2 + p - getValue(s[i - len]) * c2 % p + getValue(s[i])) % p;if (x1 == (*ans.rbegin()).first && x2 == (*ans.rbegin()).second) {flag = true;return ans;}ans.push_back(make_pair(int(x1), int(x2)));}return ans;}static inline int getValue(char c){return c - MinValue(c); //根据实际情况定制MinValue}
};

132毫秒

这应该是目前来说最快的。

力扣 1044. 最长重复子串​

给你一个字符串 s ，考虑其所有 重复子串 ：即 s 的（连续）子串，在 s 中出现 2 次或更多次。这些出现之间可能存在重叠。

返回 任意一个 可能具有最长长度的重复子串。如果 s 不含重复子串，那么答案为 "" 。

示例 1：

输入：s = "banana"
输出："ana"
示例 2：

输入：s = "abcd"
输出：""

提示：

2 <= s.length <= 3 * 104
s 由小写英文字母组成

class Solution : public Bsearch<int> {
public:string longestDupSubstring(string s) {this->s = s;int x = 0, m = 1;for (int i = 1; i < s.length(); i++)if (s[i] == s[i - 1])x++, m = max(m, x); else x = 0;int len = find(m, s.length() - 1);return GetFirstSameSubStr(s,len - 1);}bool isOk(int x){return GetFirstSameSubStr(s,x)=="";}string s;
};

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