mirror of
https://github.com/Kiritow/OJ-Problems-Source.git
synced 2024-03-22 13:11:29 +08:00
52 lines
1.4 KiB
C++
52 lines
1.4 KiB
C++
|
#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;
|
||
|
|
}
|