P4170 [CQOI2007]涂色

#include<bits/stdc++.h>
using namespace std;
const int n=55;
char s[n];
int f[n][n];
//const int INF=1e8;


int main(){
    scanf("%s",s+1);
    int len = strlen(s+1);
    memset(f,0x3F,sizeof(f));
    for(int i=1;i<=len;i++){
        f[i][i]=1;
    }
    for(int l=1;l<len;l++){
        for(int i=1;i+l<=len;i++){
            int j=i+l;
            if(s[i]==s[j]){
                f[i][j]=min(f[i+1][j],f[i][j-1]);
            }
            else {
                for(int k=i;k<=j-1;k++){
                    f[i][j]=min(f[i][j],f[i][k]+f[k+1][j]);
                }
            }
        }
    }
    printf("%d\n",f[1][len]);
    return 0;
}