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Submission #862237

# Submission time Handle Problem Language Result Execution time Memory
862237 2023-10-17T19:26:25 Z Cyber_Wolf Logičari (COCI21_logicari) C++17
110 / 110
 202 ms 56632 KB 
#include <bits/stdc++.h>
 
using namespace std;
 
#define lg long long 
 
const lg N = 2e5+5;
 
vector<lg> adj[N], adj2[N];
lg dp[N][4][2][2], par[N], vis[N], tmp, node1, node2;
 
lg get(lg src)
{
	if(par[src] == src)	return src;
	return par[src] = get(par[src]);
}
 
lg dfs(lg src, lg b, lg x, lg y, lg par = -1)
{
	b &= 3;
	auto&ret = dp[src][b][x][y];
	if(src == node1 && (b&1) != x)	
	{
		// cout << src << ' ' << b << ' ' << x << ' ' << y << '\n';
		// cout << 1e14 << '\n';
		return ret = 1e14;
	}
	if(src == node2 && (b&1) != y)	
	{
		// cout << src << ' ' << b << ' ' << x << ' ' << y << '\n';
		// cout << 1e14 << '\n';
		return ret = 1e14;
	}
	if(~ret)	return ret;
	ret = 1e14;
	lg sum = 0;
	lg check = 0;
	for(auto it : adj[src])
	{
		if(it == par)	continue;
		if(src != node1 && src != node2 && ((it == node1 && x) || (it == node2 && y)))	check++;
		sum += dfs(it, (b << 1), x, y, src);
	}
	if((src == node1 && y) || (src == node2 && x))	check++;
	if(src == node1 || src == node2)
	{
		if(par != node1 && par != node2)	check += b/2;
	}
	else if((b&2))	check++;
	if(check > 1)
	{
		// cout << "FAIL " << src << ' ' << b << ' ' << x << ' ' << y << ' ' << check << ' ' << par << '\n';
		// cout << ret << '\n';
		return ret = 1e14;
	}
	if(b&2)
	{
		ret = sum;
		// cout << "b " << src << ' ' << b << ' ' << x << ' ' << y << ' ' << check << ' ' << par << '\n';
		// cout << ret << '\n';
		return ret;
	}
	lg ox = 1;
	for(auto it : adj[src])
	{
		if(it == par)	continue;
		if(check && it != node1 && it != node2)	continue;
		ox = 0;
		ret = min(ret, dfs(it, (b << 1)|1, x, y, src)-dfs(it, (b << 1), x, y, src)+sum+1);
	}
	if(check && ox)	ret = sum;
	// cout << "a " << src << ' ' << b << ' ' << x << ' ' << y << ' ' << check << ' ' << par << '\n';
	// cout << ret << '\n';
	return ret;
}
 
vector<lg> path;
 
lg odd_cycle(lg src, lg par = -1)
{
	vis[src] = ++tmp;
	for(auto it : adj2[src])
	{
		if(it == par)	continue;
		if(vis[it])
		{
			path.push_back(it);
			return (vis[src]-vis[it]-1)%2;
		}
		if(odd_cycle(it, src))	
		{
			path.push_back(src);
			return true;
		}
	}
	return 0;
}
 
int main()
{
	lg n;
	cin >> n;
	for(int i = 1; i <= n; i++)	par[i] = i;
	for(int i = 0; i < n; i++)
	{
		lg u, v;
		cin >> u >> v;
		int a = get(u), b = get(v);
		adj2[u].push_back(v);
		adj2[v].push_back(u);
		if(a == b)	
		{
			node1 = u;
			node2 = v;
			continue;
		}
		par[a] = b;
		adj[u].push_back(v);
		adj[v].push_back(u);
	}
	memset(dp, -1, sizeof(dp));
	lg ans = 1e18;
	for(int i = 0; i < 4; i++)
	{
		ans = min({ans, dfs(1, 0, i%2, i/2), dfs(1, 1, i%2, i/2)+1});
	}
	if(ans >= 1e14)	ans = -1;
	cout << ans << '\n';
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 37724 KB Output is correct
2 Correct 5 ms 37780 KB Output is correct
3 Correct 6 ms 37720 KB Output is correct
4 Correct 6 ms 37728 KB Output is correct
5 Correct 202 ms 56632 KB Output is correct
6 Correct 168 ms 56144 KB Output is correct
7 Correct 166 ms 53540 KB Output is correct
8 Correct 185 ms 54264 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 37724 KB Output is correct
2 Correct 6 ms 37764 KB Output is correct
3 Correct 6 ms 37724 KB Output is correct
4 Correct 5 ms 37720 KB Output is correct
5 Correct 6 ms 37724 KB Output is correct
6 Correct 6 ms 37820 KB Output is correct
7 Correct 6 ms 37724 KB Output is correct
8 Correct 6 ms 37724 KB Output is correct
9 Correct 6 ms 37816 KB Output is correct
10 Correct 6 ms 37820 KB Output is correct
11 Correct 6 ms 37724 KB Output is correct
12 Correct 5 ms 37720 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 37724 KB Output is correct
2 Correct 6 ms 37764 KB Output is correct
3 Correct 6 ms 37724 KB Output is correct
4 Correct 5 ms 37720 KB Output is correct
5 Correct 6 ms 37724 KB Output is correct
6 Correct 6 ms 37820 KB Output is correct
7 Correct 6 ms 37724 KB Output is correct
8 Correct 6 ms 37724 KB Output is correct
9 Correct 6 ms 37816 KB Output is correct
10 Correct 6 ms 37820 KB Output is correct
11 Correct 6 ms 37724 KB Output is correct
12 Correct 5 ms 37720 KB Output is correct
13 Correct 6 ms 37724 KB Output is correct
14 Correct 6 ms 37884 KB Output is correct
15 Correct 7 ms 37724 KB Output is correct
16 Correct 7 ms 37768 KB Output is correct
17 Correct 6 ms 37724 KB Output is correct
18 Correct 7 ms 37736 KB Output is correct
19 Correct 6 ms 37724 KB Output is correct
20 Correct 7 ms 37728 KB Output is correct
21 Correct 6 ms 37736 KB Output is correct
22 Correct 6 ms 37728 KB Output is correct
23 Correct 6 ms 37900 KB Output is correct
24 Correct 7 ms 37988 KB Output is correct

Subtask #4
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 37724 KB Output is correct
2 Correct 5 ms 37780 KB Output is correct
3 Correct 6 ms 37720 KB Output is correct
4 Correct 6 ms 37728 KB Output is correct
5 Correct 202 ms 56632 KB Output is correct
6 Correct 168 ms 56144 KB Output is correct
7 Correct 166 ms 53540 KB Output is correct
8 Correct 185 ms 54264 KB Output is correct
9 Correct 6 ms 37724 KB Output is correct
10 Correct 6 ms 37764 KB Output is correct
11 Correct 6 ms 37724 KB Output is correct
12 Correct 5 ms 37720 KB Output is correct
13 Correct 6 ms 37724 KB Output is correct
14 Correct 6 ms 37820 KB Output is correct
15 Correct 6 ms 37724 KB Output is correct
16 Correct 6 ms 37724 KB Output is correct
17 Correct 6 ms 37816 KB Output is correct
18 Correct 6 ms 37820 KB Output is correct
19 Correct 6 ms 37724 KB Output is correct
20 Correct 5 ms 37720 KB Output is correct
21 Correct 6 ms 37724 KB Output is correct
22 Correct 6 ms 37884 KB Output is correct
23 Correct 7 ms 37724 KB Output is correct
24 Correct 7 ms 37768 KB Output is correct
25 Correct 6 ms 37724 KB Output is correct
26 Correct 7 ms 37736 KB Output is correct
27 Correct 6 ms 37724 KB Output is correct
28 Correct 7 ms 37728 KB Output is correct
29 Correct 6 ms 37736 KB Output is correct
30 Correct 6 ms 37728 KB Output is correct
31 Correct 6 ms 37900 KB Output is correct
32 Correct 7 ms 37988 KB Output is correct
33 Correct 120 ms 45300 KB Output is correct
34 Correct 148 ms 45148 KB Output is correct
35 Correct 126 ms 45148 KB Output is correct
36 Correct 136 ms 45312 KB Output is correct
37 Correct 31 ms 39524 KB Output is correct
38 Correct 126 ms 45492 KB Output is correct
39 Correct 14 ms 38244 KB Output is correct
40 Correct 139 ms 45352 KB Output is correct
41 Correct 127 ms 46788 KB Output is correct
42 Correct 106 ms 46792 KB Output is correct
43 Correct 192 ms 53580 KB Output is correct
44 Correct 144 ms 52284 KB Output is correct