Submission #1153182

#	Time	Username	Problem	Language	Result	Execution time	Memory
1153182		mingga	Candies (JOI18_candies)	C++20	100 / 100	99 ms	10076 KiB

candies

#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, a[N], l[N], r[N];
bool del[N];

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;
	for(int i = 1; i <= n; i++) cin >> a[i];
	priority_queue<pair<int, int>> q;
	for(int i = 1; i <= n; i++) {
		l[i] = i - 1;
		r[i] = i + 1;
		q.push({a[i], i});
	}
	int cur = 0;
	a[0] = a[n + 1] = -inf;
	for(int i = 1; i <= (n + 1) / 2;) {
		auto x = q.top(); q.pop();
		int val = x.fi, id = x.se;
		if(del[id]) continue;
		cur += val;
		cout << cur << ln;
		int lef = l[id], rig = r[id];
		del[lef] = 1, del[rig] = 1;
		int new_val = a[lef] + a[rig] - a[id];
		r[id] = r[rig];
		l[r[rig]] = id;
		l[id] = l[lef];
		r[l[lef]] = id;
		a[id] = new_val;
		q.push({new_val, id});
		i++;
	}
    cerr << "\nTime: " << clock() * 1000 / CLOCKS_PER_SEC;
}

Compilation message (stderr)

candies.cpp: In function 'int main()':
candies.cpp:22:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   22 |                 freopen(task ".INP", "r", stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
candies.cpp:23:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   23 |                 freopen(task ".OUT", "w", stdout);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 8 / 8
• Subtask 2: 92 / 92