Submission #321638

#	Time	Username	Problem	Language	Result	Execution time	Memory
321638		casperwang	Foehn Phenomena (JOI17_foehn_phenomena)	C++14	100 / 100	132 ms	13164 KiB

foehn_phenomena

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

const int MAXN = 200000;
int n, q, s, t;
int l, r, x;
int a[MAXN+1];
int d[MAXN+1];
int ans;

signed main() {
  ios_base::sync_with_stdio(0), cin.tie(0);
  cin >> n >> q >> s >> t;
  for (int i = 0; i <= n; i++) {
    cin >> a[i];
    if (i) d[i] = a[i] - a[i-1];
  }
  for (int i = 1; i <= n; i++)
    ans += -(d[i] > 0 ? s : t) * d[i];
  for (int i = 1; i <= q; i++) {
    cin >> l >> r >> x;
    ans -= -(d[l] > 0 ? s : t) * d[l];
    d[l] += x;
    ans += -(d[l] > 0 ? s : t) * d[l];
    if (r < n) {
      ans -= -(d[r+1] > 0 ? s : t) * d[r+1];
      d[r+1] -= x;
      ans += -(d[r+1] > 0 ? s : t) * d[r+1];
    }
    cout << ans << "\n";
  }
}

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