Submission #1075266

#	Time	Username	Problem	Language	Result	Execution time	Memory
1075266		quangminh412	Foehn Phenomena (JOI17_foehn_phenomena)	C++14	100 / 100	76 ms	13136 KiB

foehn_phenomena

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

/*
  John Watson
  https://codeforces.com/profile/quangminh98

  Mua Code nhu mua Florentino !!
*/

#define faster() ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define ll long long

const int maxn = 2e5 + 9;

int n, q, s, t;
ll a[maxn], w[maxn];

ll calc(ll x) { return x * (x < 0 ? s : t); }

signed main()
{
	if (fopen("test.inp", "r"))
	{
		freopen("test.inp", "r", stdin);
		freopen("test.out", "w", stdout);
	}
	faster();

	cin >> n >> q >> s >> t;
	
	ll cur = 0;
	for (int i = 0; i <= n; i++)
	{
		cin >> a[i];
		w[i] = a[i - 1] - a[i];
		if (i != 0) cur += calc(w[i]);
	}
	
	while (q--)
	{
		int l, r; cin >> l >> r;
		ll x; cin >> x;
		
		cur -= calc(w[l]);
		w[l] -= x;
		cur += calc(w[l]);
		if (r != n)
		{
			cur -= calc(w[r + 1]);
			w[r + 1] += x;
			cur += calc(w[r + 1]);
		}
		
		cout << cur << '\n';
	}

	return 0;
}

Compilation message (stderr)

foehn_phenomena.cpp: In function 'int main()':
foehn_phenomena.cpp:25:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   25 |   freopen("test.inp", "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
foehn_phenomena.cpp:26:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   26 |   freopen("test.out", "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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