Submission #1017945

#	Time	Username	Problem	Language	Result	Execution time	Memory
1017945		vjudge1	Foehn Phenomena (JOI17_foehn_phenomena)	C++17	100 / 100	84 ms	7252 KiB

foehn_phenomena

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define size(x) (int)x.size()
#define all(x) x.begin(), x.end()

template<class A, class S>
bool chmin(A &a, const S &s) {
  return a > s ? (a = s) == s : false;
}
template<class A, class S>
bool chmax(A &a, const S &s) {
  return a < s ? (a = s) == s : false;
}

signed main(){
  cin.tie(nullptr)->sync_with_stdio(false);
  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<int> d(n + 1);
  
  int 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 (l > 0 && l <= n) {
      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;
      }
    }
    
    if (l > 0 && l <= n) {
      d[l] = d[l] + x;
      if(d[l] > 0){
        ans -= d[l] * s;
      } else {
        ans -= d[l] * t;
      }
    }
    
    if(r + 1 <= n){
      d[r + 1] = d[r + 1] - x;
      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