OJ-Problems-Source/HDOJ/3538_autoAC.cpp

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#include<algorithm>
#include <cstring>
#include<cstdio>
#include<stdlib.h>
#define L(i) (1 << (i))
#define MAXM 3000000
using namespace std;
int dp[3000000][22];
int dis[22][22];
int f[22];
int main()
{
int n, m;
while(~scanf("%d%d",&n, &m))
{
memset(f,0,sizeof(f));
for(int i = 0;i < L(n);i ++)
for(int j = 0;j < n;j ++)
dp[i][j] = MAXM;
for(int i = 0;i < n;i ++)
for(int j = 0;j < n;j ++)
scanf("%d",dis[i] + j);
for(int i = 0;i < m;i ++)
{
int u, v;
scanf("%d%d", &u,&v);
f[v] |= L(u);
}
dp[1][0] = 0;
int S = L(n);
for(int s = 0;s < S;s ++)
for(int i = 0;i < n;i ++)
if(dp[s][i] == MAXM)continue;
else
for(int j = 1;j < n;j ++)
{
if(dis[i][j] == -1)continue;
if(!(s & L(i)))continue;
if(s & L(j))continue;
if(f[j] != (s & f[j]))continue;
dp[s|L(j)][j] = min(dp[s][i] + dis[i][j],dp[s|L(j)][j]);
}
int ans = MAXM;
S = L(n) - 1;
for(int i = 0;i < n;i ++)
ans = min(ans, dp[S][i]);
if(ans >= MAXM)printf("-1\n");
else printf("%d\n",ans);
}
return 0;
}