#include "hack.h"
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
template<typename T>
bool assign_min(T& a, T b) {
if (a > b) {
a = b;
return true;
}
return false;
}
template<typename T>
bool assign_max(T& a, T b) {
if (a < b) {
a = b;
return true;
}
return false;
}
bool check(int l, int r) {
int x = sqrt(r - l);
vector<ll> v;
for (int i = 1; i <= x; i++) {
v.push_back(i);
}
for (int i = l; i < r; i += x) {
v.push_back(i);
}
v.push_back(r);
sort(v.begin(), v.end());
v.resize(unique(v.begin(), v.end()) - v.begin());
return collisions(v) != 0;
}
int hack() {
int l = 1, r = 1e9 + 1, sol = 0;
while (r - l > 1) {
int m = (l + r) / 2;
// cout << "! " << l << " " << m << " => " << check(l, m) << "\n";
if (check(l, m)) {
r = m;
} else {
l = m;
}
}
return l;
}
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