Submission #783661

#	Time	Username	Problem	Language	Result	Execution time	Memory
783661		devariaota	Foehn Phenomena (JOI17_foehn_phenomena)	C++17	100 / 100	103 ms	7216 KiB

foehn_phenomena

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define fi first
#define se second
#define endl "\n"
#define pii pair<ll,ll>
#define pb push_back
#define vi vector<ll>
#define pque priority_queue
#define pqueg priority_queue<ll,vector<ll>,greater<ll>>
#define que queue<ll>
#define FOR(m,i,n) for(int i=(m); i<=(n); i++)
#define FORM(m,i,n) for(int i=(m); i>=(n); i--)
ll n,q,s,t,ans,l,r,x;
ll a[200200],diff[200200];
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cin >> n >> q >> s >> t;
  FOR(0,i,n) {
    cin >> a[i];
  }
  FOR(1,i,n) {
    diff[i] = a[i] - a[i-1];
    if(diff[i] > 0) {
      ans -= diff[i] * s;
    }
    else {
      ans += abs(diff[i]) * t;
    }
  }
  while(q--) {
    cin >> l >> r >> x;
    if(diff[l] > 0) {
      ans += diff[l] * s;
    }
    else {
      ans -= abs(diff[l]) * t;
    }
    diff[l] += x;
    if(diff[l] > 0) {
      ans -= diff[l] * s;
    }
    else {
      ans += abs(diff[l]) * t;
    }
    if(r != n) {
      if(diff[r+1] > 0) {
        ans += diff[r+1] * s;
      }
      else {
        ans -= abs(diff[r+1]) * t;
      }
      diff[r+1] -= x;
      if(diff[r+1] > 0) {
        ans -= diff[r+1] * s;
      }
      else {
        ans += abs(diff[r+1]) * t;
      }
    }
    cout << ans << endl;
  }
}

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