Submission #1308961

#	Time	Username	Problem	Language	Result	Execution time	Memory
1308961		lyra_g13	Lasers (NOI19_lasers)	C++20	0 / 100	1 ms	332 KiB

lasers

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

int main() {
  std::ios_base::sync_with_stdio(false);
  std::cin.tie(nullptr);

  ll l, r;
  cin >> l >> r;

  vector<vector<ll>> a(r);

  ll sum1 = 0;
  ll sum2 = 0;
  for (int i = 0; i < r; i++) {
    ll x;
    cin >> x;

    for (int j = 0; j < x; j++) {
      cin >> a[i][j];
      if (i == 0) {
        sum1 += a[i][j];
      } else {
        sum2 += a[i][j];
      }
    }
  }

  ll maxx = max(sum1, sum2);

  if (maxx == l) {
    cout << l << "\n";
    return 0;
  }
  if (maxx == 0) {
    cout << 0 << "\n";
    return 0;
  } else {
    if (l % 2 == 0)
      cout << (maxx - (l / 2)) * 2 << "\n";
    else {
      cout << (maxx - (l / 2)) * 2 - 1 << "\n";
    }
    return 0;
  }
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 14
• Subtask 3: 0 / 20
• Subtask 4: 0 / 21
• Subtask 5: 0 / 22
• Subtask 6: 0 / 13