/in/foo.cc: In function 'int main()':
/in/foo.cc:38:50: warning: suggest parentheses around arithmetic in operand of '|' [-Wparentheses]
      f[i|(1<<k)][k]=min(f[i|(1<<k)][k],f[i|(1<<j)-1][j]+cost[j][k]);
                                            ~~~~~~^~