wrong_source.cpp

#include<bits/stdc++.h>
using namespace std;

typedef long long int lli;

const int INF = INT_MAX/3;

struct segment_tree {
  int n;
  vector<int> dat;
  int empty;
  segment_tree(int n_, int empty_) :
    n(8), dat(100, 100), empty(empty_) {}
};

int floors[(int)3e5 + 8];

int main() {
  cout << fixed << setprecision(10);
  lli N, M;
  cin >> N >> M;
  vector<lli> S(N),T(N);
  for (int i = 0; i < M; ++i) {
    cin >> S[i] >> T[i];
    S[i]--;
    floors[S[i]]++; floors[T[i]]--;
  }
  for (int i = 1; i < (int)3e5 + 1; ++i) floors[i] += floors[i - 1];

  segment_tree seg(N, INF);
  return 0;
}