/in/foo.cc: In function 'int main()':
/in/foo.cc:50:16: warning: 'r' may be used uninitialized in this function [-Wmaybe-uninitialized]
         int l, r;
                ^
/in/foo.cc:50:13: warning: 'l' may be used uninitialized in this function [-Wmaybe-uninitialized]
         int l, r;
             ^