/in/foo.cc: In function 'int main()':
/in/foo.cc:21:26: warning: unused variable 'q' [-Wunused-variable]
  int s[5010],t[5010],i,k,q,m,n,sum,mx[26000000][26000000];
                          ^
/in/foo.cc:21:32: warning: unused variable 'sum' [-Wunused-variable]
  int s[5010],t[5010],i,k,q,m,n,sum,mx[26000000][26000000];
                                ^~~