SCU 4438 Censor（Hash）题解

题意：找出字符串p中的w串删除，反复操作，直到找不到w，输出这个串

思路：哈希处理前缀和，如果值相同就删掉。

代码：

#include<iostream>
#include<algorithm>
#include<cstdio>
#include<stdio.h>
#include<string.h>
#include<queue>
#include<cmath>
#include<map>
#include<set>
#include<vector>
using namespace std;
typedef unsigned long long ull;
const int maxn = 5e6 + 10;
const ull seed = 131;
ull bin[maxn], Hash[maxn];
char p[maxn], w[maxn], ans[maxn];
void init(){bin[0] = 1;for(int i = 1; i < maxn; i++)bin[i] = bin[i - 1] * seed;
}
int main(){init();while(~scanf("%s%s", w + 1, p + 1)){int lenw = strlen(w + 1), len = strlen(p + 1);ull aim = 0;if(lenw > len){printf("%s\n", p + 1);}else{int point = 1;for(int i = 1; i <= lenw; i++)aim = aim * seed + w[i] - 'a';Hash[0] = 0;for(int i = 1; i <= lenw - 1; i++){Hash[point] = Hash[point - 1] * seed + p[i] - 'a';ans[point++] = p[i];}for(int i = lenw; i <= len; i++){Hash[point] = Hash[point - 1] * seed + p[i] - 'a';ans[point] = p[i];if(point >= lenw && Hash[point] - Hash[point - lenw] * bin[lenw] == aim){point -= lenw;}point++;}for(int i = 1; i < point; i++){printf("%c", ans[i]);}printf("\n");}}return 0;
}

转载于:https://www.cnblogs.com/KirinSB/p/9895757.html

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