Submission #1281111

#	Time	Username	Problem	Language	Result	Execution time	Memory
1281111		KickingKun	Foehn Phenomena (JOI17_foehn_phenomena)	C++20	30 / 100	68 ms	5932 KiB

foehn_phenomena

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

#define ll long long
#define ull unsigned long long
#define ld long double
#define bigint __int128
#define emb emplace_back
#define pb push_back
#define pii pair <int, int>
#define fi first
#define se second
#define all(v) v.begin(), v.end()
#define Task ""

#define MASK(k) (1ull << k)
#define bitcnt(k) __builtin_popcount(k)
#define testBit(n, k) ((n >> k) & 1)
#define flipBit(n, k) (n ^ (1ll << k))
#define offBit(n, k) (n & ~MASK(k))
#define onBit(n, k) (n | (1ll << k))

template <class T> bool minimize(T &a, T b) {if (a > b) {a = b; return true;} return false;}
template <class T> bool maximize(T &a, T b) {if (a < b) {a = b; return true;} return false;}

const int N = 2e5 + 5, lim = 60, mod = 1e9 + 7;
const ll INF = 1e18;

int n, q, s, t, a[N];
ll delta[N];
ll temp;

ll cost(int x) {
	if (x < 0) return 1ll * x * s;
	return 1ll * x * t;
}

int main() {
	ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);

	if (fopen(Task".inp", "r")) {
		freopen(Task".inp", "r", stdin);
		freopen(Task".out", "w", stdout);
	}

	cin >> n >> q >> s >> t;
	for (int i = 0; i <= n; i++) cin >> a[i];
	for (int i = 1; i <= n; i++) {
		delta[i] = a[i - 1] - a[i];
		temp += cost(delta[i]);
	}

	while (q--) {
		int l, r, x; cin >> l >> r >> x;
		temp -= cost(delta[l]); delta[l] -= x; temp += cost(delta[l]);
		if (r < n) {
			temp -= cost(delta[r + 1]);
			delta[r + 1] += x;
			temp += cost(delta[r + 1]);
		}
		cout << temp << '\n';
	}
}

Compilation message (stderr)

foehn_phenomena.cpp: In function 'int main()':
foehn_phenomena.cpp:42:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   42 |                 freopen(Task".inp", "r", stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
foehn_phenomena.cpp:43:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   43 |                 freopen(Task".out", "w", stdout);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 30 / 30
• Subtask 2: 0 / 10
• Subtask 3: 0 / 60