lightoj 1025 区间dp

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;

char a[70];
ll  dp[70][70];

int main(){
	int T; scanf("%d",&T);
	int n;
	int ca = 0;
	while(T--){
		memset(dp,0,sizeof(dp));
		scanf("%s",a+1);
		int n = strlen(a+1);
		for(int i = 1; i <= n; ++i){
			for(int j = 1; j+i-1 <= n; ++j) {
				int l = j; int r = l+i-1;
				dp[l][r] += dp[l+1][r];
				dp[l][r] += dp[l][r-1];
				if(a[l] == a[r]) dp[l][r] ++;
				else dp[l][r] -= dp[l+1][r-1];
			}
		}
		printf("Case %d: %lld
", ++ca, dp[1][n]);
	}
	return 0;
}