poj 1159 最长回文

方法  LCS

 #include<iostream>
 #include<cstring>
 #include<algorithm>
 #include<stdio.h>
 #include<cmath>
 using namespace std; short int dp[][]; char str[];
 int main( )
 {
     int N;
     while( scanf("%d",&N) != EOF )
     {
         scanf("%s",str+); int len = strlen( str+ );
         memset( dp,,sizeof(dp) );  int Max = ;
         for( int i = len; i >= ; i-- )
         for( int j = ; j <= i - ; j++ ){
             if( str[i] == str[j] ) dp[i][j] = dp[i+][j-]+;
             else dp[i][j] = max( dp[i+][j],dp[i][j-] );
             if( j == i- ) Max = max( Max,dp[i][j]*);
             else Max = max( Max,dp[i][j]*+ );
         }
         cout<<N-Max<<endl;
     }
     return ;
 }