Submission #826258

#	Time	Username	Problem	Language	Result	Execution time	Memory
826258		NhanBeoo	Foehn Phenomena (JOI17_foehn_phenomena)	C++17	100 / 100	110 ms	13120 KiB

foehn_phenomena

#include <bits/stdc++.h>
using namespace std;

#define int ll
#define MAX LLONG_MAX
#define st first
#define nd second
#define endl '\n'
#define SZ(x) ((int)x.size())
#define ALL(x) x.begin(), x.end()
typedef long long ll;
typedef pair< int, int > ii;
typedef pair< int, ii > iii;
typedef vector< int > vi;
typedef vector< ii > vii;
typedef vector< iii > viii;
typedef vector< vi > vvi;
typedef vector< vii > vvii;
typedef vector< viii > vviii;

const int N = 2e5 + 5;
int n, q, s, t; 
int a[N], suf[N];
int sum = 0;

int cal(int v){
	if(v > 0) return - v * s;
	else return - v * t;
}

signed main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	
	cin >> n >> q >> s >> t;
	for(int i=0; i<=n; i++) cin >> a[i];
	for(int i=1; i<=n; i++){ 
		suf[i] = a[i] - a[i-1];
		sum += cal(suf[i]);
	}
	while(q--){
		int l, r, v; cin >> l >> r >> v;
		// sum -= cal(suf[l]) + cal(suf[r+1]);
		// suf[l] += v; suf[r+1] -= v;
		// sum += cal(suf[l]) + cal(suf[r+1]);
		sum -= cal(suf[l]);
		suf[l] += v;
		sum += cal(suf[l]);
		if(r+1 <= n){
			sum -= cal(suf[r+1]);
			suf[r+1] -= v;
			sum += cal(suf[r+1]);
		}
		cout << sum << endl;
	}
} 

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