ABC001 - D 感雨時刻の整理

#include <iostream>
#include <string>

using namespace std;

int main() {
  int n;
  cin >> n;
  bool rain[289];
  for (int i = 0; i < 289; i++)
    rain[i] = false;
  string se;
  for (int i = 0; i < n; i++) {
    cin >> se;
    int s_h = stoi(se.substr(0, 2));
    int s_m = stoi(se.substr(2, 2));
    int e_h = stoi(se.substr(5, 2));
    int e_m = stoi(se.substr(7, 2));
    int s_m_rnd = (s_m / 5) * 5;
    int e_m_rnd = ((e_m - 1) / 5 + 1) * 5;
    int sum_s_m = s_h * 60 + s_m_rnd;
    int sum_e_m = e_h * 60 + e_m_rnd;
    for (int j = sum_s_m / 5; j < sum_e_m / 5; j++)
      rain[j] = true;
  }

  int now = false;
  for (int i = 0; i < 289; i++) {
    if (rain[i]) {
      if (!now) {
	now = true;
	int h = i / 12;
	int m = i % 12 * 5;
	if (h < 10)
	  cout << "0";
	cout << h;
	if (m < 10)
	  cout << "0";
	cout << m << "-";
      }
    } else {
      if (now) {
	now = false;
	int h = i / 12;
	int m = i % 12 * 5;
	if (h < 10)
	  cout << "0";
	cout << h;
	if (m < 10)
	  cout << "0";
	cout << m << endl;
      }
    }
    if (i == 288 && now == true)
      cout << "2400" << endl;
  }
  return 0;
}