Submission #1087106

#	Time	Username	Problem	Language	Result	Execution time	Memory
1087106		avighna	Lasers (NOI19_lasers)	C++17	0 / 100	828 ms	3420 KiB

lasers

#include <bits/stdc++.h>

typedef long long ll;

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

  ll l, r;
  std::cin >> l >> r;
  std::vector<bool> good(r);
  ll good_sum = 0;
  std::priority_queue<std::pair<ll, ll>, std::vector<std::pair<ll, ll>>,
                      std::greater<>>
      pq;
  std::vector<ll> left(r), sum(r);
  std::vector<std::deque<ll>> rows(r);
  for (ll cnt = 0; cnt < r; ++cnt) {
    auto &v = rows[cnt];
    ll len;
    std::cin >> len;
    v.resize(len);
    for (auto &i : v) {
      std::cin >> i;
    }
    sum[cnt] = std::accumulate(v.begin(), v.end(), 0LL);
    pq.push({left[cnt] + v[0], cnt});
    v.pop_front();
    if (1 < l - (sum[cnt] - left[cnt]) + 1) {
      good[cnt] = true;
      good_sum++;
    } else {
      good[cnt] = false;
    }
  }

  ll ans = 0;
  for (ll i = 1; i <= l; ++i) {
    while (!pq.empty() and pq.top().first < i) {
      auto [l, i] = pq.top();
      pq.pop();
      left[i] = l;
      // x blocks from right ==> l - x + 1 from left
      good_sum -= good[i];
      if (i < l - (sum[i] - left[i]) + 1) {
        good[i] = true;
        good_sum++;
      } else {
        good[i] = false;
      }
      if (!rows[i].empty()) {
        pq.push({left[i] + rows[i][0], i});
        rows[i].pop_front();
      }
    }
    ans += good_sum != r;
  }
  std::cout << ans << '\n';
}

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