oj.uz

Submission #695315

# Submission time Handle Problem Language Result Execution time Memory
695315 2023-02-05T01:17:54 Z GusterGoose27 Jail (JOI22_jail) C++11
5 / 100
 143 ms 9396 KB 
#include <bits/stdc++.h>

using namespace std;

typedef pair<int, int> pii;

const int MAXN = 12e4;
const int BITS = 17;

vector<int> edges[MAXN];
bool adj[500][500];
int n, m;
pii queries[MAXN];
int lca[MAXN][BITS];
int depth[MAXN];
vector<int> order;
bool vis[500];

class query {
public:
	int l, r;
	bool f;
	query(int l, int r, bool f) : l(l), r(r), f(f) {}
};

bool operator<(query &a, query &b) {
	return (a.l == b.l) ? (a.r > b.r) : (a.l < b.l); 
}

void dfs(int cur = 0, int p = -1) {
	for (int nxt: edges[cur]) {
		if (nxt == p) continue;
		depth[nxt] = depth[cur]+1;
		lca[nxt][0] = cur;
		dfs(nxt, cur);
	}
}

int get_lca(int x, int y) {
	if (depth[x] < depth[y]) swap(x, y);
	int diff = depth[x]-depth[y];
	int p = 0;
	while (diff) {
		if (diff & 1) x = lca[x][p];
		diff /= 2;
		p++;
	}
	if (x == y) return x;
	for (int i = 16; i >= 0; i--) {
		if (lca[x][i] != lca[y][i]) {
			x = lca[x][i];
			y = lca[y][i];
		}
	}
	return lca[x][0];
}

int dist(int x, int y) {
	return depth[x]+depth[y]-2*depth[get_lca(x, y)];
}

bool on_seg(int a, int b, int c) {
	return dist(a, b) == dist(a, c)+dist(b, c);
}

void dfs2(int cur) {
	vis[cur] = 1;
	for (int i = 0; i < m; i++) {
		if (!vis[i] && adj[cur][i]) dfs2(i);
	}
	order.push_back(cur);
}

int main() {
	int t; cin >> t;
	while (t--) {
		bool s1 = 1;
		cin >> n;
		for (int i = 0; i < n; i++) edges[i].clear();
		for (int i = 0; i < n-1; i++) {
			int x, y; cin >> x >> y;
			x--; y--;
			edges[x].push_back(y);
			edges[y].push_back(x);
			if (y-x != 1) s1 = 0;
		}
		cin >> m;
		for (int i = 0; i < m; i++) {
			int x, y; cin >> x >> y;
			queries[i] = pii(x-1, y-1);
		}
		if (s1) {
			vector<query> sorted;
			for (int i = 0; i < m; i++) {
				if (queries[i].first > queries[i].second) sorted.push_back(query(queries[i].second, queries[i].first, 1));
				else sorted.push_back(query(queries[i].first, queries[i].second, 0));
			}
			sort(sorted.begin(), sorted.end());
			int r[2];
			r[0] = r[1] = -1;
			bool ans = 1;
			for (query q: sorted) {
				if (r[q.f] >= q.r || r[!q.f] >= q.l) {
					ans = 0;
					break;
				}
				r[q.f] = q.r;
			}
			if (ans) {
				cout << "Yes\n";
			}
			else cout << "No\n";
		}
		else if (m <= 500) {
			dfs();
			for (int i = 1; i < BITS; i++) {
				for (int j = 0; j < n; j++) {
					lca[j][i] = lca[lca[j][i-1]][i-1];
				}
			}
			for (int i = 0; i < m; i++) fill(adj[i], adj[i]+m, 0);
			for (int i = 0; i < m; i++) {
				for (int j = 0; j < m; j++) {
					if (i == j) continue;
					adj[i][j] = (on_seg(queries[i].first, queries[i].second, queries[j].first) || on_seg(queries[j].first, queries[j].second, queries[i].second));
				}
			}
			if (m == 2) {
				if (adj[0][1] && adj[1][0]) cout << "NO\n";
				else cout << "NO\n";
				continue;
			}
			fill(vis, vis+m, 0);
			order.clear();
			for (int i = 0; i < m; i++) {
				if (!vis[i]) dfs2(i);
			}
			bool ans = 1;
			for (int i = 0; i < m && ans; i++) {
				for (int j = i+1; j < m && ans; j++) {
					if (adj[order[i]][order[j]]) ans = 0;
				}
			}
			if (ans) cout << "YES\n";
			else cout << "NO\n";
		}
		else {
			srand(0);
			if (rand()%2) cout << "YES\n";
			else cout << "NO\n";
		}
	}
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 3028 KB Output is correct
2 Correct 2 ms 3028 KB Output is correct
3 Correct 2 ms 3028 KB Output is correct
4 Correct 23 ms 3028 KB Output is correct
5 Correct 43 ms 3028 KB Output is correct
6 Correct 4 ms 3028 KB Output is correct
7 Correct 4 ms 3028 KB Output is correct
8 Correct 4 ms 3028 KB Output is correct
9 Correct 61 ms 3284 KB Output is correct
10 Correct 71 ms 6860 KB Output is correct
11 Correct 11 ms 3028 KB Output is correct
12 Correct 57 ms 3084 KB Output is correct
13 Correct 98 ms 8060 KB Output is correct
14 Correct 97 ms 8176 KB Output is correct
15 Correct 103 ms 8172 KB Output is correct
16 Correct 143 ms 9396 KB Output is correct
17 Correct 105 ms 8168 KB Output is correct
18 Correct 135 ms 9384 KB Output is correct
19 Correct 102 ms 8144 KB Output is correct
20 Correct 118 ms 8252 KB Output is correct
21 Correct 101 ms 8136 KB Output is correct
22 Correct 104 ms 8168 KB Output is correct

Subtask #2
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 3028 KB Output is correct
2 Correct 2 ms 3028 KB Output is correct
3 Correct 4 ms 3028 KB Output is correct
4 Incorrect 4 ms 3168 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #3
0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 3028 KB Output is correct
2 Correct 2 ms 3028 KB Output is correct
3 Correct 4 ms 3028 KB Output is correct
4 Incorrect 4 ms 3168 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #4
0 / 28.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 3028 KB Output is correct
2 Correct 2 ms 3028 KB Output is correct
3 Correct 4 ms 3028 KB Output is correct
4 Incorrect 4 ms 3168 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #5
0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 3028 KB Output is correct
2 Correct 2 ms 3028 KB Output is correct
3 Correct 4 ms 3028 KB Output is correct
4 Incorrect 4 ms 3168 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #6
0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 3028 KB Output is correct
2 Incorrect 2 ms 3028 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #7
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 3028 KB Output is correct
2 Correct 2 ms 3028 KB Output is correct
3 Correct 2 ms 3028 KB Output is correct
4 Correct 23 ms 3028 KB Output is correct
5 Correct 43 ms 3028 KB Output is correct
6 Correct 4 ms 3028 KB Output is correct
7 Correct 4 ms 3028 KB Output is correct
8 Correct 4 ms 3028 KB Output is correct
9 Correct 61 ms 3284 KB Output is correct
10 Correct 71 ms 6860 KB Output is correct
11 Correct 11 ms 3028 KB Output is correct
12 Correct 57 ms 3084 KB Output is correct
13 Correct 98 ms 8060 KB Output is correct
14 Correct 97 ms 8176 KB Output is correct
15 Correct 103 ms 8172 KB Output is correct
16 Correct 143 ms 9396 KB Output is correct
17 Correct 105 ms 8168 KB Output is correct
18 Correct 135 ms 9384 KB Output is correct
19 Correct 102 ms 8144 KB Output is correct
20 Correct 118 ms 8252 KB Output is correct
21 Correct 101 ms 8136 KB Output is correct
22 Correct 104 ms 8168 KB Output is correct
23 Correct 1 ms 3028 KB Output is correct
24 Correct 2 ms 3028 KB Output is correct
25 Correct 4 ms 3028 KB Output is correct
26 Incorrect 4 ms 3168 KB Output isn't correct
27 Halted 0 ms 0 KB -