Submission #44702

#	Time	Username	Problem	Language	Result	Execution time	Memory
44702		cheater2k	Swap (BOI16_swap)	C++14	0 / 100	2 ms	548 KiB

swap

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

const int N = 200005;
const int INF = 1e9;

int n, a[N];

void solve(int v) {
	int lef = (v << 1);
	int rig = (v << 1 | 1);

	if (rig > n) {
		if (a[lef] < a[v]) {
			swap(a[lef], a[v]);
		}
		return;
	}

	int minall = min({a[v], a[lef], a[rig]});
	if (minall == a[v]) {
		return;
	}
	else if (minall == a[lef]) {
		swap(a[lef], a[v]); return;
	}
	else { // minall = a[rig]
		// -> a[rig], a[v], a[lef]
		// -> a[rig], a[lef], a[v]
		int val[2] = {a[v], a[lef]};
		a[v] = a[rig];

		vector <int> best(4, INF + 2);
		int best_t = 0;
		for (int t = 0; t < 2; ++t) {
			// a[lef] = val[t], a[rig] = val[t ^ 1]
			int curlef = val[t];
			int currig = val[t ^ 1];
			int childlef = min( (lef * 2 <= n) ? a[lef * 2] : INF, (lef * 2 + 1 <= n) ? a[lef * 2 + 1] : INF );
			int childrig = min( (rig * 2 <= n) ? a[rig * 2] : INF + 1, (rig * 2 + 1 <= n) ? a[rig * 2 + 1] : INF + 1 );

			if (curlef > childlef) swap(curlef, childlef);
			if (currig > childrig) swap(currig, childrig);

			vector <int> cur;
			cur.push_back(curlef);
			cur.push_back(currig);
			cur.push_back(childlef);
			cur.push_back(childrig);

			if (cur < best) {
				best_t = t;
				best = cur;
			}
		}

		a[lef] = val[best_t];
		a[rig] = val[best_t ^ 1];
	}
}

int main() {
	ios_base::sync_with_stdio(false); cin.tie(0);

	cin >> n;
	for (int i = 1; i <= n; ++i) cin >> a[i];

	for (int i = 1; i <= (n / 2); ++i) {
		solve(i);
	}

	for (int i = 1; i <= n; ++i) {
		printf("%d ", a[i]);
	}
	printf("\n");
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 11
• Subtask 3: 0 / 27
• Subtask 4: 0 / 20
• Subtask 5: 0 / 32