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为什么dp数组定义在函数里面就RE,定义成全局变量就AC了#include <iostream>
#include <cstdio>
#include <cstring>
#define N 5002
using namespace std;
short dp[N][N];
int main()
{
int n;
while(cin>>n)
{
char *str1=new char[n+1];
char *str2=new char[n+1];
cin>>str1;
int i,j;
for(i=0;i<n;i++)
str2[i]=str1[n-i-1];
str2[i]='\0';
memset(dp,0,sizeof(dp));
for(i=0;i<n;i++)
{
for(j=0;j<n;j++)
{
if(str1[i]==str2[j])
dp[i+1][j+1]=dp[i][j]+1;
else
dp[i+1][j+1]=max(dp[i][j+1],dp[i+1][j]);
}
}
cout<<n-dp[n][n]<<endl;
}
return 0;
}
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