題目鏈接：點擊打開鏈接

#include<stdio.h> #include<iostream> #include<string.h> #include<set> #include<vector> #include<map> #include<math.h> #include<queue> #include<string> #include<stdlib.h> #include<algorithm> using namespace std; #define N 5001000 #define mod 1000000007 #define hehe 137731735 #define ll __int64 ll n; char s[N]; ll x[N], y[N]; ll dp[N]; int main(){ll i,j;while(gets(s)) {dp[0] = 0;for(i=0;s[i];i++) {if('0'<=s[i]&&s[i]<='9')s[i] = s[i]-'0';else if('a'<=s[i]&&s[i]<='z')s[i] = s[i]-'a'+10;else s[i] = s[i]-'A'+36;}ll len = i;x[0] = 0;ll dou = 1;for(i=1;i<=len;i++){ x[i] = (x[i-1]+s[i-1]*dou)%mod; dou = (dou*hehe)%mod; }y[len+1] = 0;for(i=1;i<=len;i++) { y[i] = (y[i-1]*hehe+s[i-1])%mod;}ll ans = 0;for(i=1;i<=len;i++) if(x[i]==y[i]) {dp[i] = dp[i>>1]+1;ans += dp[i];}cout<<ans<<endl;}return 0; }

轉載于:https://www.cnblogs.com/gavanwanggw/p/6900128.html

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