POJ-2771 Guardian of Decency 最大独立子集

不能恋爱问题。

代码如下：

#include <cstdlib>
#include <cstdio>
#include <cstring>
using namespace std;

int N;

int G[505][505], visit[505], marry[505];

struct P
{
    int h;
    char sex[5], style[105], fav[105];
}p[505];

int judge(int x, int y)
{
    if (abs(p[x].h-p[y].h)>40)
        return 0;
    else if (p[x].sex[0] == p[y].sex[0])
        return 0;
    else if (strcmp(p[x].style, p[y].style))
        return 0;
    else if (!strcmp(p[x].fav, p[y].fav))
        return 0;
    else return 1;
}

int path(int u) 
{
    for (int i = 1; i <= N; ++i) {
        if (!G[u][i] || visit[i]) {
            continue;
        }
        visit[i] = 1;
        if (!marry[i] || path(marry[i])) {
            marry[i] = u;
            return 1;
        }
    }
    return 0;
}

int main()
{
    int T, ans;
    scanf("%d", &T);
    while (T--) {
        ans = 0;    
        memset(G, 0, sizeof (G));
        memset(marry, 0, sizeof (marry));
        scanf("%d", &N);
        for (int i = 1; i <= N; ++i) {
            scanf("%d %s %s %s", &p[i].h, p[i].sex, p[i].style, p[i].fav);
        }   
        for (int i = 1; i <= N; ++i) {
            for (int j = 1; j <= N; ++j) {
                if (judge(i, j)) {
                    G[i][j] = 1;
                }
            }
        }   
        for (int i = 1; i <= N; ++i) {
            memset(visit, 0, sizeof (visit));
            if (path(i)) {
                ++ans;
            }
        }
        printf("%d\n", N-(ans>>1));
    }
    return 0;
}