Submission #1144217

#	Time	Username	Problem	Language	Result	Execution time	Memory
1144217		mingga	Foehn Phenomena (JOI17_foehn_phenomena)	C++20	100 / 100	88 ms	7240 KiB

foehn_phenomena

#include "bits/stdc++.h"

using namespace std;

#define ln "\n"
#define pb push_back
#define fi first
#define se second
#define all(x) (x).begin(), (x).end()
#define sz(x) ((int)(x).size())
#define int long long
const int mod = 1e9 + 7;
const int inf = 2e18;
const int N = 2e5 + 7;

int n, q, s, t, a[N], d[N];

int calc(int x) {
	return x <= 0 ? -x * t : -s * x; 
}

signed main() {
	cin.tie(0) -> sync_with_stdio(0);
	#define task ""
	if(fopen(task ".INP", "r")) {
		freopen(task ".INP", "r", stdin);
		freopen(task ".OUT", "w", stdout);
	}
	cin >> n >> q >> s >> t;
	int cur = 0;
	for(int i = 0; i <= n; i++) cin >> a[i];
	for(int i = 1; i <= n; i++) {
		d[i] = a[i] - a[i - 1];
		cur += (calc(a[i] - a[i - 1]));
		// cout << a[i] - a[i - 1] << ' ' << calc(a[i] - a[i - 1]) << ln;
	}
	// cout << cur << ln;
	for(int i = 1; i <= q; i++) {
		int l, r, x; cin >> l >> r >> x;
		cur -= calc(d[l]);
		d[l] += x;
		cur += calc(d[l]);
		if(r < n) {
			cur -= calc(d[r + 1]);
			d[r + 1] -= x;
			cur += calc(d[r + 1]);
		}
		cout << cur << ln;
	}
  cerr << "\nTime: " << clock() * 1000 / CLOCKS_PER_SEC;
}

Compilation message (stderr)

foehn_phenomena.cpp: In function 'int main()':
foehn_phenomena.cpp:26:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   26 |                 freopen(task ".INP", "r", stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
foehn_phenomena.cpp:27:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   27 |                 freopen(task ".OUT", "w", stdout);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

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