제출 #1276296

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1276296		SmuggingSpun	Sjeckanje (COCI21_sjeckanje)	C++20	0 / 110	1 ms	332 KiB

Main

#include<bits/stdc++.h>
#define taskname "E"
using namespace std;
typedef long long ll;
const int lim = 2e5 + 5;
const ll INF = 1e18;
struct Data{
	ll pos, neg, bal;
	Data(){}
	Data(ll pos, ll neg, ll bal){
		this->pos = pos;
		this->neg = neg;
		this->bal = bal;
	}
};
Data st[lim << 2];
int n, q, a[lim];
ll laz[lim << 2];
Data merge(Data a, Data b){
	Data ans;
	ans.pos = max({a.pos, b.pos, a.bal + b.pos});
	ans.neg = max({a.neg, b.neg, a.bal + b.neg});
	ans.bal = max({a.bal, b.bal, a.bal + b.bal, a.pos + b.neg, a.neg + b.pos});
	return ans;
}
void build(int id, int l, int r){
	laz[id] = 0;
	if(l == r){
		st[id] = Data(a[l], -a[l], 0LL);
		return;
	}
	int m = (l + r) >> 1;
	build(id << 1, l, m);
	build(id << 1 | 1, m + 1, r);
	st[id] = merge(st[id << 1], st[id << 1 | 1]);
}
void push_down(int id){
	st[id << 1].pos += laz[id];
	st[id << 1].neg -= laz[id];
	laz[id << 1] += laz[id];
	st[id << 1 | 1].pos += laz[id];
	st[id << 1 | 1].neg -= laz[id];
	laz[id << 1 | 1] += laz[id];
	laz[id] = 0;
}
void update(int id, int l, int r, int u, int v, int x){
	if(l > v || r < u){
		return;
	}
	if(u <= l && v >= r){
		st[id].pos += x;
		st[id].neg -= x;
		laz[id] += x;
		return;
	}
	int m = (l + r) >> 1;
	push_down(id);
	update(id << 1, l, m, u, v, x);
	update(id << 1 | 1, m + 1, r, u, v, x);
	st[id] = merge(st[id << 1], st[id << 1 | 1]);
}
int main(){
	ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
	if(fopen(taskname".inp", "r")){
		freopen(taskname".inp", "r", stdin);
	}
	cin >> n >> q;
	for(int i = 1; i <= n; i++){
		cin >> a[i];
	}
	build(1, 1, n);
	for(int _ = 0; _ < q; _++){
		int l, r, x;
		cin >> l >> r >> x;
		update(1, 1, n, l, r, x);
		cout << st[1].bal << "\n";
	}
}

컴파일 시 표준 에러 (stderr) 메시지

Main.cpp: In function 'int main()':
Main.cpp:65:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   65 |                 freopen(taskname".inp", "r", stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 15
• Subtask 2: 0 / 40
• Subtask 3: 0 / 55