Submission #209151

#	Time	Username	Problem	Language	Result	Execution time	Memory
209151		bensonlzl	Foehn Phenomena (JOI17_foehn_phenomena)	C++14	100 / 100	134 ms	5752 KiB

foehn_phenomena

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

ll N, Q, S, T, X, L, R, diff[200005], cont[200005], init = 0;

ll cost(int x){
	if (diff[x] < 0) return T*diff[x];
	else return S*diff[x];
}

int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cin >> N >> Q >> S >> T;
	S = -S;
	T = -T;
	for (int i = 0; i <= N; ++i){
		cin >> diff[i];
	}
	for (int i = N; i >= 1; --i){
		diff[i] -= diff[i-1];
	}
	for (int i = 1; i <= N; ++i){
		init += cost(i);
	}
	for (int i = 1; i <= Q; ++i){
		cin >> L >> R >> X;
		init -= cost(L);
		if (R < N) init -= cost(R+1);
		diff[L] += X;
		diff[R+1] -= X;
		init += cost(L);
		if (R < N) init += cost(R+1);
		cout << init << '\n';
	}
}

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