Submission #1017921

#	Time	Username	Problem	Language	Result	Execution time	Memory
1017921		vjudge1	Foehn Phenomena (JOI17_foehn_phenomena)	C++17	100 / 100	76 ms	6484 KiB

foehn_phenomena

#include "bits/stdc++.h"
using namespace std;
#define ar array
typedef long long ll;
signed main() {
  ios::sync_with_stdio(0); cin.tie(0);
  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<ll> d(n + 1);
  ll ans = 0;
  for(int i=1;i<=n;i++){
    d[i] = a[i] - a[i - 1];
    if(d[i] > 0){
      ans -= d[i] * s;
    } else {
      ans -= d[i] * t;
    }
  }
  while(q--){
    int l, r, x; cin >> l >> r >> x;
    if(d[l] > 0){
      ans += d[l] * s;
    } else {
      ans += d[l] * t;
    }
    if(r + 1 <= n){
      if(d[r + 1] > 0){
        ans += d[r + 1] * s;
      } else {
        ans += d[r + 1] * t;
      }
    }
    d[l] = d[l] + x;
    if(r + 1 <= n){
      d[r + 1] = d[r + 1] - x;
    }
    if(d[l] > 0){
      ans -= d[l] * s;
    } else {
      ans -= d[l] * t;
    }
    if(r + 1 <= n){
      if(d[r + 1] > 0){
        ans -= d[r + 1] * s;
      } else {
        ans -= d[r + 1] * t;
      }
    }
    cout<<ans<<"\n";
  }
}

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