Submission #51522

#	Time	Username	Problem	Language	Result	Execution time	Memory
51522		huynhsmd	Foehn Phenomena (JOI17_foehn_phenomena)	C++17	100 / 100	718 ms	7724 KiB

foehn_phenomena

#include<bits/stdc++.h>

using namespace std;

#define int long long

const int N = 200005;

int n , q , s , t , ans;
int a[N] , bit[N];
signed main(){
	//freopen("1.inp","r",stdin);
	cin >> n >> q >> s >> t;
	n++;
	for(int i = 1 ; i <= n ; ++ i)
		cin >> a[i];
	for(int i = 2; i <= n ; i ++){
        bit[i] = a[i] - a[i - 1];
        if (bit[i] >= 0) ans -= bit[i] * s;
        else ans -= bit[i] * t;
    }
	while(q--){
		int l , r , val;
		cin >> l >> r >> val;
		l++ ; r++;
		if (bit[l] >= 0) ans += bit[l] * s;
        else ans += bit[l] * t;
		bit[l] += val;
        if (bit[l] >= 0) ans -= bit[l] * s;
        else ans -= bit[l] * t;
        if (r != n) {
            if (bit[r + 1] >= 0) ans += bit[r + 1] * s;
            else ans += bit[r + 1] * t;
            bit[r + 1] -= val;
            if (bit[r + 1] >= 0) ans -= bit[r + 1] * s;
            else ans -= bit[r + 1] * t;
        }
		cout << ans <<"\n";
	}	
}

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