Submission #1287226

#	Time	Username	Problem	Language	Result	Execution time	Memory
1287226		TrieTr	Foehn Phenomena (JOI17_foehn_phenomena)	C++20	100 / 100	90 ms	7312 KiB

foehn_phenomena

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

void local() {
	#define taskname ""
	if(fopen(taskname".inp", "r")) {
		freopen(taskname".inp", "r", stdin);
		freopen(taskname".out", "w", stdout);
	}
}

#define ll long long
#define int long long
#define fi first
#define se second
#define fastio ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);

template <class X, class Y> bool mini(X& x, Y y) {return x > y ? x = y, true : false;}
template <class X, class Y> bool maxi(X& x, Y y) {return x < y ? x = y, true : false;}

const int N = 1e6 + 5;

struct FenwickTree {
	using T = ll;
	vector<T>bit; int n;
	void init(int n_) {
		bit.assign((n = n_) + 5, 0);
	}
	void update(int id, int x) {
		for(; id <= n; id += id & -id) bit[id] += x;
	}
	T get(int id) {
		if(id <= 0) return 0;
		T sum = 0;
		for(; id; id -= id & -id) sum += bit[id];
		return sum;
	}
	T getRan(int l, int r) {
		return get(r) - get(l - 1);
	}
} fen;

ll res = 0;
int n, q, a[N], s, t;

ll pls_cal(int x, int y) {
	if(x < y) return -1ll * s * (y - x);
	return 1ll * t * (x - y);
}

signed main() {
	fastio; local();	
	cin >> n >> q >> s >> t;
	for(int i = 1; i <= n + 1; i++) cin >> a[i];
	for(int i = 1; i <= n; i++) {
		res += pls_cal(a[i], a[i + 1]);
	}
	fen.init(n + 1);
	for(int i = 1; i <= q; i++) {
		int l, r, x; cin >> l >> r >> x; l++; r++;
		res -= pls_cal(a[l - 1] + fen.get(l - 1), a[l] + fen.get(l));	
		if(r < n + 1) res -= pls_cal(a[r] + fen.get(r), a[r + 1] + fen.get(r + 1));
		fen.update(l, x); fen.update(r + 1, -x);
		res += pls_cal(a[l - 1] + fen.get(l - 1), a[l] + fen.get(l));	
		if(r < n + 1) res += pls_cal(a[r] + fen.get(r), a[r + 1] + fen.get(r + 1));
		cout << res << '\n';
	}
}

Compilation message (stderr)

foehn_phenomena.cpp: In function 'void local()':
foehn_phenomena.cpp:7:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    7 |                 freopen(taskname".inp", "r", stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
foehn_phenomena.cpp:8:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    8 |                 freopen(taskname".out", "w", stdout);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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