hdu3336

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next 数组

#include <cstdio>#include <cstring>#include <iostream>#include <time.h>#include <cstdlib>#include <cmath>#include <algorithm>using namespace std;int const MOD = 10007;int const MAXN = 200010;char s[MAXN];int next[MAXN],dp[MAXN];inline void Get_Next(int n){    memset(next,0,sizeof(next));    for(int i = 1;i < n;i++){        int j = next[i];        while(j && s[i] != s[j]) j = next[j];        if(s[i] == s[j]) next[i + 1] = j + 1;        else next[i + 1] = 0;    }}int main(){    int T;    while(~scanf("%d",&T)){        while(T--){            int n;            scanf("%d",&n);            scanf("%s",s);            Get_Next(n);            for(int i = 0;i < n;i++){                dp[i] = 1;            }            dp[0] = 0;            int sum = 0;            for(int i = 1;i <= n;i++){                dp[i] = dp[next[i]] + 1;                sum = (sum + dp[i]) % MOD;            }            printf("%d\n",sum);        }    }    return 0;}

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