/in/foo.cc:20:0: warning: "maxn" redefined
#define maxn 2000005
/in/foo.cc:17:0: note: this is the location of the previous definition
#define maxn 560050
/in/foo.cc: In function 'll dfs(ll, ll, ll, ll)':
/in/foo.cc:31:18: warning: unused variable 'j' [-Wunused-variable]
ll ans, num, i, j;
^
/in/foo.cc: In function 'int main()':
/in/foo.cc:58:11: warning: unused variable 'i' [-Wunused-variable]
ll a, b, i, j, ans1 = 0, ans2 = 0;
^
/in/foo.cc:58:14: warning: unused variable 'j' [-Wunused-variable]
ll a, b, i, j, ans1 = 0, ans2 = 0;
^