/in/foo.cc: In function 'void search(int)':
/in/foo.cc:14:32: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  if(lbound[now]==-1 || ans!=-1 && sum+lbound[now]>ans) return;
                        ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
/in/foo.cc: In function 'void lowerbound()':
/in/foo.cc:31:24: warning: 'bestj' may be used uninitialized in this function [-Wmaybe-uninitialized]
 int ok[N],now,i,j,best,bestj;
                        ^~~~~