Submission #895421

#	Time	Username	Problem	Language	Result	Execution time	Memory
895421		Richw818	Foehn Phenomena (JOI17_foehn_phenomena)	C++17	100 / 100	87 ms	12444 KiB

foehn_phenomena

#include <bits/stdc++.h>

using namespace std;

int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(nullptr);
  int n, q, s, t;
  cin >> n >> q >> s >> t;
  vector<int> a(n + 1);
  for (int i = 0; i <= n; i++) {
    cin >> a[i];
  }
  vector<long long> diff(n);
  long long ans = 0;
  for (int i = 0; i < n; i++) {
    diff[i] = a[i + 1] - a[i];
    ans += (diff[i] > 0 ? diff[i] * -s : diff[i] * -t);
  }
  auto update = [&](int i, int v) -> void {
    ans -= (diff[i] > 0 ? diff[i] * -s : diff[i] * -t);
    diff[i] += v;
    ans += (diff[i] > 0 ? diff[i] * -s : diff[i] * -t);
  };
  while (q--) {
    int l, r, x;
    cin >> l >> r >> x;
    update(l - 1, x);
    if (r < n) {
      update(r, -x);
    }
    cout << ans << '\n';
  }
  return 0;
}

• Subtask 1: 30 / 30
• Subtask 2: 10 / 10
• Subtask 3: 60 / 60