/in/foo.cc: In function 'bool check(int)':
/in/foo.cc:35:12: warning: unused variable 'time' [-Wunused-variable]
  int i, j, time = 1000;
            ^~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:71:11: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   mid = l + r >> 1;
         ~~^~~
/in/foo.cc:60:9: warning: unused variable 'j' [-Wunused-variable]
  int i, j, l, r, mid, ans = 0;
         ^