#include <bits/stdc++.h> using namespace std; using ll = long long; using vi = vector<int>; const int N = 210000; int n; vector<array<int, 2>> a; ll plan_roller_coaster(vi s, vi t) { n = s.size(); for (int i = 0; i < n; i++) a.push_back({s[i], t[i]}); vi val; sort(begin(a), end(a)); for (int i = 0; i < n; i++) { int pos = lower_bound(begin(a), end(a), array<int, 2>{a[i][1], 0}) - begin(a); val.push_back(n - pos - (a[i][1] <= a[i][0])); } sort(begin(val), end(val)); for (int i = 0; i < n; i++) if (val[i] < i) return 1; return 0; } #ifdef LOCAL int main() { int n; assert(1 == scanf("%d", &n)); std::vector<int> s(n), t(n); for (int i = 0; i < n; ++i) assert(2 == scanf("%d%d", &s[i], &t[i])); long long ans = plan_roller_coaster(s, t); printf("%lld\n", ans); return 0; } #endif

railroad.h:1:9: warning: #pragma once in main file
    1 | #pragma once
      |         ^~~~
railroad_c.h:1:9: warning: #pragma once in main file
    1 | #pragma once
      |         ^~~~