LeetCode() Largest Number

　　全排列，超时，知道超时，只是想验证一下。

class Solution {
public:string largestNumber(vector<int>& nums) {sort(nums.begin(),nums.end());string res="";res=f(nums);while(next_permutation(nums.begin(),nums.end())){if(res<f(nums))res=f(nums);}return res;}string f(vector<int>& coll){string res;for(int i=0;i<coll.size();++i){ostringstream sss;sss<<coll[i];res+=sss.str();}return res;}
};

　　en ,这个也不对

class Solution {
public:string largestNumber(vector<int>& nums) {vector<string> coll;for(int i=0;i<nums.size();++i){ostringstream sss;sss<<nums[i];coll.push_back(sss.str());}sort(coll.begin(),coll.end());string res="";for(int i=coll.size()-1;i>=0;--i)res+=coll[i];return res;}};

　　事实证明，过了点不吃饭真的很危险，又低血糖了。

class Solution {
public:string largestNumber(vector<int>& nums) {vector<string> coll;for(int i=0;i<nums.size();++i){ostringstream sss;sss<<nums[i];coll.push_back(sss.str());}string res="";auto ite=coll.begin();sort(ite,ite+coll.size(),c);for(int i=coll.size()-1;i>=0;--i)res+=coll[i];if(res[0] == '0')return "0";return res;}static bool c(const string a,const string b){string ab=a+b;string ba=b+a;return ab<ba;}
};

　　更精简的

class Solution { public: string largestNumber(vector<int>& nums) { sort(nums.begin(), nums.end(), [](const int& lhs, const int & rhs){return to_string(lhs) + to_string(rhs) > to_string(rhs) + to_string(lhs);}); if (nums[0] == 0) return "0"; return accumulate(nums.begin(), nums.end(), string(""), [](const string& a, int b){ return a + to_string(b);}); } };

转载于:https://www.cnblogs.com/yanqi110/p/5016917.html

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