/in/foo.cc: In function 'int main()':
/in/foo.cc:36:27: warning: unused variable 'cnt' [-Wunused-variable]
         int sl = 0,sr = 0,cnt = 0;
                           ^~~
/in/foo.cc:34:17: warning: unused variable 'r' [-Wunused-variable]
     int l = n/2,r = n-l,T = 0,ansl = -inf,ansr = inf, sum = inf;
                 ^