Submission #1017973

#	Time	Username	Problem	Language	Result	Execution time	Memory
1017973		vjudge1	Foehn Phenomena (JOI17_foehn_phenomena)	C++17	100 / 100	83 ms	13140 KiB

foehn_phenomena

#include <bits/stdc++.h>
#include <algorithm>
#include <iostream>
#include <string>
using namespace std;
#define FOR(i,n) for(int i=0;i<n;i++)
#define ROF(i,m,n) for(int i=m;i<=n;i++)
#define vi vector<int>
#define pb push_back
#define alle(a) a.begin(),a.end()
#define all(n) begin(n), end(n)
#define rall(n) rbegin(n),rend(n)
#define int long long
#define vecs vector<int> 
#define ll long long
#define ss second 
#define ff first
const int INF = 1e9;
const int MOD = 1e9 + 7;
void solve(){
    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";
  }
}
signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL); cout.tie(NULL);
    int t = 1;
    while (t--) {
        solve();
    }
    return 0;
}

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