Submission #1308951

#	Time	Username	Problem	Language	Result	Execution time	Memory
1308951		lyra_g13	Lasers (NOI19_lasers)	C++20	0 / 100	10 ms	572 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<ll> a(r);
  ll maxx = 0;
  for (int i = 0; i < r; i++) {
    ll x;
    cin >> x;
    for (int j = 0; j < x; j++) {
      cin >> a[i];
      maxx = max(a[i], maxx);
    }
  }
  if (l % 2 == 0) {
    ll figure = maxx;
    if (maxx > l / 2) {
      cout << maxx - l / 2;
    } else {
      cout << 0 << "\n";
    }
    return 0;
  } else {
    ll figure = maxx;
    if (maxx > (l / 2) + 1) {
      cout << maxx - (l / 2) + 1;
    } else {
      cout << 0 << "\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