/in/foo.cc: In function 'int main()':
/in/foo.cc:15:31: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
  for (int u=1;u<=n;u++) f[1<<u-1][u]=0;
                              ~^~
/in/foo.cc:19:16: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
    if ((u&(1<<i-1))!=0)//这个人有过OK
               ~^~
/in/foo.cc:22:18: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
      if ((u&(1<<j-1))==0)//这个人可以传
                 ~^~
/in/foo.cc:24:16: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
       f[u|(1<<j-1)][j]=mymin(f[u|(1<<j-1)][j],f[u][i]+a[i][j]);
               ~^~
/in/foo.cc:24:39: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
       f[u|(1<<j-1)][j]=mymin(f[u|(1<<j-1)][j],f[u][i]+a[i][j]);
                                      ~^~