ZOJ2067 经典 DP

题目：一个由‘.’和‘#’组成矩形，统计里面'.'组成的矩形的个数。

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自己写挂了，懒得搞了

#include <stdio.h>
#include <string.h>
#define MAX 110
#define inf 0x7fffffff
char a[MAX][MAX];
int count[MAX][MAX];
int n;

int min(int x,int y)
{
    return x<y?x:y;
}

void sum()
{
    int i,j;
    for(i = ;i <= n; i++)
    {
        for(j = ;j <= n; j++)
        {
            if(a[i][j] == '.')
            {
                count[i][j] = count[i][j - ] + ;
            }
        }
    }
}

int Min()
{
    int i,j,k;
    int ans = ;
    for(i = ;i <= n; i++)
    {
        for(j = ;j <= n; j++)
        {
            int m = inf;
            for(k = i;k <= n && count[k][j]; k++)//1列1列判断 中间断了结束
            {
                m = min(m,count[k][j]);
                ans += m;
            }
        }
    }
    return ans;
}
int main()
{
    int i;
    while(scanf("%d",&n)!=EOF)
    {
        for(i = ;i <= n; i++)
            scanf("%s",a[i] + );
        memset(count,,sizeof(count));
        sum();
        printf("%d\n",Min());
    }
    return ;
}