/in/foo.cc: In function 'bool cmp(node, node)':
/in/foo.cc:23:29: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
     return x.v<y.v||x.v==y.v&&x.d<y.d;
                     ~~~~~~~~^~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:92:30: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
         if (sum<ans||sum==ans&&v[i]>v[k]) ans=sum,k=i;
                      ~~~~~~~~^~~~~~~~~~~