Submission #51905

#	Time	Username	Problem	Language	Result	Execution time	Memory
51905		WLZ	Foehn Phenomena (JOI17_foehn_phenomena)	C++17	100 / 100	224 ms	168964 KiB

foehn_phenomena

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

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int n, q, s, t;
  cin >> n >> q >> s >> t;
  auto newVal = [&](long long x) {
    if (x < 0) {
      return x * s;
    } else {
      return x * t;
    }
  };
  vector<int> a(n + 1);
  for (int i = 0; i <= n; i++) {
    cin >> a[i];
  }
  vector<long long> b(n + 1);
  long long ans = 0ll;
  for (int i = 1; i <= n; i++) {
    b[i] = a[i - 1] - a[i];
    if (b[i] < 0) {
      ans += b[i] * s;
    } else {
      ans += b[i] * t;
    }
  }
  while (q--) {
    int l, r, x;
    cin >> l >> r >> x;
    if (l > 0) {
      ans -= newVal(b[l]);
      b[l] -= x;
      ans += newVal(b[l]);
    }
    if (r < n) {
      ans -= newVal(b[r + 1]);
      b[r + 1] += x;
      ans += newVal(b[r + 1]);
    }
    cout << ans << '\n';
  }
  return 0;
}

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