http://acm.hdu.edu.cn/showproblem.php?pid=1565

#include <algorithm>
#include <cstdio>
#include <cstdlib>
#include <cstring>
using namespace std;
int dp[25][20000], s[20000], len, Map[25][25], n;

int check(int m) {
    if( (m & (m<<1)) != 0)//非法狀態
        return 0;

    return 1;
}

void Inint() {
    len = 0;//最大取值只有17771
    for(int i = 0; i < (1<<n); i++) {
        if(check(i))
            s[len++] = i;
    }
}

int Count(int id, int m) {
    int d = n-1, sum = 0;
    while(m > 0) {
        if(m & 1)
            sum += Map[id][d];

        d--;
        m = m >>1;
    }

    return sum;
}

int main() {
    while(scanf("%d", &n) != EOF) {
        if(n == 0) {
            printf("0\n");
            continue;
        }

        memset(dp, 0, sizeof(dp));
        memset(Map, 0, sizeof(Map));

        for(int i = 0; i < n; i++)
            for(int j = 0; j < n; j++)
                scanf("%d", &Map[i][j]);

        Inint();
        for(int i = 0; i < len; i++)
            dp[0][i] = Count(0, s[i]);

        int ans = 0;
        for(int r = 1; r < n; r++) {
            for(int i = 0; i < len; i++)
                for(int j = 0; j < len; j++)
                    if((s[i] & s[j]) == 0) {//這個可以融合
                        dp[r][i]= max( dp[r][i], dp[r-1][j]+Count(r,s[i]));
                    }
        }


        for(int i = 0; i < len; i++)
            if(dp[n-1][i]>ans)
                ans = dp[n-1][i];
        printf("%d\n",ans);
    }

    return 0;
}