/in/foo.cc:10:16: warning: integer constant is too large for its type
 const LL INF = 0x7f7f7f7f7f7f7f7f7f7f;
                ^~~~~~~~~~~~~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:41:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
         mid = l + r >> 1;
               ~~^~~