/in/foo.cc: In function 'int main()':
/in/foo.cc:16:25: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
     for(int i=0; i<(1<<n+1); ++i)
                        ~^~
/in/foo.cc:27:25: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
     for(int i=1; i<(1<<n+1); ++i)
                        ~^~
/in/foo.cc:38:32: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
         ans = min(ans, dp[(1<<n+1)-1][i]+G[i][0]);
                               ~^~