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답안 #1020589

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
1020589 2024-07-12T07:19:13 Z BuzzyBeez Tree Rotations (POI11_rot) C++17
100 / 100
 209 ms 36832 KB 
#include <bits/stdc++.h>
using namespace std;

const int N = 4e5;

int a[N + 8];
int adj[N + 8][2];
vector<int> _list[N + 8];
int sz[N + 8];

int n, tmp, id = 1, x;
void input() {
	cin >> x;
	if (x) {_list[id].push_back(x); ++sz[id]; a[id] = x; return;}
	int t = id;
	adj[t][0] = id + 1;
	++id; input();
	adj[t][1] = id + 1;
	++id; input();
}

void DFS_sz(int u, int p) {
	if (!adj[u][0]) return;
	DFS_sz(adj[u][0], u); sz[u] += sz[adj[u][0]];
	DFS_sz(adj[u][1], u); sz[u] += sz[adj[u][1]];
}

struct Binary_Indexed_Tree {
	vector<int> BIT;
	
	Binary_Indexed_Tree() {BIT.assign(N / 2 + 8, 0);}
	
	int pt;
	void update(int u, int v) {
		pt = u;
		while (pt <= N / 2) {
			BIT[pt] += v;
			pt += pt & -pt;
		}
	}
	
	int res;
	int pf(int p) {
		if (p <= 0) return 0;
		res = 0; pt = p;
		while (pt) {
			res += BIT[pt];
			pt -= pt & -pt;
		}
		return res;
	}
	
	int range(int l, int r) {
		if (l > r) return 0;
		return pf(r) - pf(l - 1);
	}
} tree;

long long costLR, costRL, ans = 0;
void DFS(int u, int p) {
	if (sz[u] > 1) { 
		int L = adj[u][0], R = adj[u][1];
		if (sz[L] < sz[R]) swap(L, R);
		// cout << u << " -> " << R << endl;
		DFS(R, u);
		for (int item : _list[R]) tree.update(item, -1);
		// cout << u << " -> " << L << endl;
		DFS(L, u);
		costLR = costRL = 0;
		for (int item : _list[R]) costLR += tree.range(item + 1, n), costRL += tree.range(1, item - 1);
		ans += min(costLR, costRL);
		// cout << u << ' ' << costLR << ' ' << costRL << '\n';
		for (int item : _list[R]) tree.update(item, +1);
		for (int v : {L, R}) {
			if (_list[u].size() < _list[v].size()) swap(_list[u], _list[v]);
			for (int item : _list[v]) _list[u].push_back(item);
		}
	}
	if (a[u]) tree.update(a[u], +1);
}

signed main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0); cout.tie(0);
	cin >> n; input();
	DFS_sz(1, 0);
	DFS(1, 0); cout << ans;
}

Subtask #1
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 10588 KB Output is correct
2 Correct 4 ms 10588 KB Output is correct
3 Correct 5 ms 10588 KB Output is correct
4 Correct 5 ms 10588 KB Output is correct
5 Correct 6 ms 10588 KB Output is correct

Subtask #2
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 10584 KB Output is correct
2 Correct 5 ms 10588 KB Output is correct
3 Correct 7 ms 10612 KB Output is correct
4 Correct 4 ms 10588 KB Output is correct

Subtask #3
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 10584 KB Output is correct
2 Correct 6 ms 10588 KB Output is correct
3 Correct 5 ms 10588 KB Output is correct
4 Correct 5 ms 10588 KB Output is correct

Subtask #4
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 8 ms 11096 KB Output is correct
2 Correct 7 ms 10856 KB Output is correct
3 Correct 7 ms 11100 KB Output is correct
4 Correct 6 ms 11404 KB Output is correct

Subtask #5
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 8 ms 12376 KB Output is correct
2 Correct 13 ms 11884 KB Output is correct
3 Correct 31 ms 13860 KB Output is correct
4 Correct 10 ms 12376 KB Output is correct

Subtask #6
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 41 ms 15440 KB Output is correct
2 Correct 29 ms 16932 KB Output is correct
3 Correct 31 ms 18780 KB Output is correct
4 Correct 31 ms 18820 KB Output is correct

Subtask #7
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 32 ms 24548 KB Output is correct
2 Correct 39 ms 22100 KB Output is correct
3 Correct 60 ms 20440 KB Output is correct
4 Correct 38 ms 18148 KB Output is correct

Subtask #8
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 55 ms 19520 KB Output is correct
2 Correct 53 ms 22232 KB Output is correct
3 Correct 52 ms 26316 KB Output is correct
4 Correct 60 ms 26200 KB Output is correct

Subtask #9
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 163 ms 31248 KB Output is correct
2 Correct 112 ms 29132 KB Output is correct
3 Correct 83 ms 27980 KB Output is correct
4 Correct 102 ms 27728 KB Output is correct
5 Correct 164 ms 29388 KB Output is correct

Subtask #10
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 90 ms 26200 KB Output is correct
2 Correct 98 ms 35664 KB Output is correct
3 Correct 121 ms 34256 KB Output is correct
4 Correct 85 ms 36832 KB Output is correct
5 Correct 209 ms 32592 KB Output is correct

Subtask #11
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 97 ms 26764 KB Output is correct
2 Correct 87 ms 29540 KB Output is correct
3 Correct 145 ms 30280 KB Output is correct
4 Correct 107 ms 29028 KB Output is correct
5 Correct 80 ms 36808 KB Output is correct
6 Correct 196 ms 33284 KB Output is correct