#include<iostream> #include<string> #include<cstring> #include<algorithm> using namespace std; typedef long long ll; ll a[5050], b[5050]; ll ans = -1; ll n, m, u; ll f = 0; void check(ll x) { f = 0; ll l = 1, r = x; ll alla = 0, allb = 0; while (r <= n) { for (int i...