Submission #129299

#	Time	Username	Problem	Language	Result	Execution time	Memory
129299		nhimnam120	Foehn Phenomena (JOI17_foehn_phenomena)	C++14	100 / 100	674 ms	7416 KiB

foehn_phenomena

#include<bits/stdc++.h>
using namespace std;
const long long N=2e5+5;
long long alt[N];
long long diff[N];
long long n,q,s,t;
signed main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	cin >> n >> q >> s >> t;
	long long ans=0;
	for(int i=0;i<=n;i++){
		cin >> alt[i];
		if(i>=1){
			diff[i] = alt[i] - alt[i-1];
			if(diff[i]>0){
				ans = ans - diff[i]*s;
			}
			else{
				ans = ans - diff[i]*t;
			}
		}
	}
	while(q--){
		long long l, r, x;
		cin >> l >> r >> x;
		if(l>=1&&l<=n){
			if(diff[l]>0){
				ans = ans + diff[l]*s;
			}
			else{
				ans = ans + diff[l]*t;
			}
		}
		if(r+1<=n&&r+1>=1){
			if(diff[r+1]>0){
				ans = ans + diff[r+1]*s;
			}
			else{
				ans = ans + diff[r+1]*t;
			}
		}
		diff[l]+=x;
		diff[r+1]-=x;
		if(l>=1&&l<=n){
			if(diff[l]>0){
				ans = ans - diff[l]*s;
			}
			else{
				ans = ans - diff[l]*t;
			}
		}
		if(r+1<=n&&r+1>=1){
			if(diff[r+1]>0){
				ans = ans - diff[r+1]*s;
			}
			else{
				ans = ans - diff[r+1]*t;
			}
		}
		cout << ans<<endl;
	}
}

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