/in/foo.cc: In function 'int main()':
/in/foo.cc:18:31: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
  for(int i=1;i<=n;i++) dp[1<<i-1][i]=0;
                              ~^~
/in/foo.cc:23:14: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
    if(!i&1<<j-1) continue;
             ~^~
/in/foo.cc:23:7: warning: suggest parentheses around operand of '!' or change '&' to '&&' or '!' to '~' [-Wparentheses]
    if(!i&1<<j-1) continue;
       ^~
/in/foo.cc:26:15: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
     if(!i&1<<k-1 || j==k) continue;
              ~^~
/in/foo.cc:26:8: warning: suggest parentheses around operand of '!' or change '&' to '&&' or '!' to '~' [-Wparentheses]
     if(!i&1<<k-1 || j==k) continue;
        ^~
/in/foo.cc:27:36: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
     dp[i][j]=min(dp[i][j],dp[i^1<<j-1][k]+_map[k][j]);
                                   ~^~
/in/foo.cc:31:12: warning: unused variable 'minn' [-Wunused-variable]
  long long minn=0x3f3f3f;
            ^~~~