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Submission #716426

# Submission time Handle Problem Language Result Execution time Memory
716426 2023-03-30T05:36:15 Z parsadox2 Love Polygon (BOI18_polygon) C++14
100 / 100
 258 ms 31164 KB 
#include <bits/stdc++.h>
#define pb 		push_back
#define F		first
#define S 		second
#define debug(x)    cout << #x << "= " << x << ", "
#define ll 		long long
#define fast 		ios::sync_with_stdio(false), cin.tie(0),  cout.tie(0)
#define SZ(x)         (int) x.size()
#define wall 		cout << endl;
using namespace std;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

const int maxn = 1e5 + 10;
int n , ar[maxn] , dp[maxn][2] , super_man;
map <string , int> mp;
vector <pair<string  , string>> edges;
vector <int> adj[maxn] , trav;
bool vis[maxn] , marked[maxn];

int Find_root(int v)
{
	vis[v] = true;
	if(vis[ar[v]])  return v;
	return Find_root(ar[v]);
}

void dfs(int v)
{
	marked[v] = true;
	bool flg = false;
	for(auto u : adj[v])  if(!marked[u])
	{
		dfs(u);
		dp[v][0] += dp[u][1];
		dp[v][1] += dp[u][1];
		if(dp[u][1] == dp[u][0])  flg = true;
	}
	dp[v][1] += flg;
}

void dfs2(int v , int root)
{
	bool flg = false;
	dp[v][0] = dp[v][1] = 0;
	for(auto u : adj[v])  if(u != root)
	{
		dfs2(u , root);
		dp[v][0] += dp[u][1];
		dp[v][1] += dp[u][1];
		if(dp[u][1] == dp[u][0] && u != super_man)  flg = true;
	}
	dp[v][1] += flg;
	if(v == super_man)  dp[v][1] = dp[v][0];
}

int solve(int root)
{
	dfs(root);
	int res = dp[root][1];
	if(ar[root] == root)  return res;
	super_man = ar[root];
	dfs2(root , root);
	int tmp = (ar[ar[root]] == root ? 2 : 1);
	res = max(res , dp[root][0] + tmp);
	return res;
}

int32_t main()
{
	fast;
	cin >> n;
	for(int i = 0 ; i < n ; i++)
	{
		string a , b;  cin >> a >> b;
		edges.pb({a , b});
		mp[a] = i;
	}
	if(n & 1)
	{
		cout << -1 << endl;
		return 0;
	}
	for(auto u : edges)
	{
		int s = mp[u.F] , e = mp[u.S];
		ar[s] = e;
		adj[e].pb(s);
	}
	int ans = n;
	for(int i = 0 ; i < n ; i++)   if(!marked[i])
	{
		int r = Find_root(i);
		ans -= solve(r);
	}
	cout << ans << endl;
	return 0;
}

Subtask #1
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2644 KB Output is correct
2 Correct 2 ms 2644 KB Output is correct
3 Correct 2 ms 2644 KB Output is correct
4 Correct 1 ms 2644 KB Output is correct
5 Correct 2 ms 2644 KB Output is correct
6 Correct 2 ms 2644 KB Output is correct
7 Correct 2 ms 2644 KB Output is correct
8 Correct 2 ms 2700 KB Output is correct
9 Correct 2 ms 2772 KB Output is correct
10 Correct 2 ms 2684 KB Output is correct
11 Correct 2 ms 2644 KB Output is correct
12 Correct 2 ms 2644 KB Output is correct
13 Correct 2 ms 2644 KB Output is correct
14 Correct 2 ms 2644 KB Output is correct
15 Correct 3 ms 2644 KB Output is correct

Subtask #2
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2644 KB Output is correct
2 Correct 2 ms 2644 KB Output is correct
3 Correct 2 ms 2644 KB Output is correct
4 Correct 213 ms 27980 KB Output is correct
5 Correct 219 ms 23324 KB Output is correct
6 Correct 258 ms 31164 KB Output is correct
7 Correct 84 ms 18896 KB Output is correct

Subtask #3
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 219 ms 20516 KB Output is correct
2 Correct 229 ms 22092 KB Output is correct
3 Correct 150 ms 21192 KB Output is correct
4 Correct 79 ms 16676 KB Output is correct
5 Correct 205 ms 27016 KB Output is correct
6 Correct 181 ms 19592 KB Output is correct
7 Correct 197 ms 19856 KB Output is correct
8 Correct 181 ms 20192 KB Output is correct
9 Correct 173 ms 19116 KB Output is correct
10 Correct 135 ms 18980 KB Output is correct
11 Correct 2 ms 2644 KB Output is correct
12 Correct 2 ms 2644 KB Output is correct
13 Correct 1 ms 2644 KB Output is correct
14 Correct 1 ms 2644 KB Output is correct

Subtask #4
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2644 KB Output is correct
2 Correct 2 ms 2644 KB Output is correct
3 Correct 2 ms 2644 KB Output is correct
4 Correct 1 ms 2644 KB Output is correct
5 Correct 2 ms 2644 KB Output is correct
6 Correct 2 ms 2644 KB Output is correct
7 Correct 2 ms 2644 KB Output is correct
8 Correct 2 ms 2700 KB Output is correct
9 Correct 2 ms 2772 KB Output is correct
10 Correct 2 ms 2684 KB Output is correct
11 Correct 2 ms 2644 KB Output is correct
12 Correct 2 ms 2644 KB Output is correct
13 Correct 2 ms 2644 KB Output is correct
14 Correct 2 ms 2644 KB Output is correct
15 Correct 3 ms 2644 KB Output is correct
16 Correct 2 ms 2644 KB Output is correct
17 Correct 2 ms 2644 KB Output is correct
18 Correct 2 ms 2644 KB Output is correct
19 Correct 213 ms 27980 KB Output is correct
20 Correct 219 ms 23324 KB Output is correct
21 Correct 258 ms 31164 KB Output is correct
22 Correct 84 ms 18896 KB Output is correct
23 Correct 219 ms 20516 KB Output is correct
24 Correct 229 ms 22092 KB Output is correct
25 Correct 150 ms 21192 KB Output is correct
26 Correct 79 ms 16676 KB Output is correct
27 Correct 205 ms 27016 KB Output is correct
28 Correct 181 ms 19592 KB Output is correct
29 Correct 197 ms 19856 KB Output is correct
30 Correct 181 ms 20192 KB Output is correct
31 Correct 173 ms 19116 KB Output is correct
32 Correct 135 ms 18980 KB Output is correct
33 Correct 2 ms 2644 KB Output is correct
34 Correct 2 ms 2644 KB Output is correct
35 Correct 1 ms 2644 KB Output is correct
36 Correct 1 ms 2644 KB Output is correct
37 Correct 210 ms 23268 KB Output is correct
38 Correct 210 ms 23296 KB Output is correct
39 Correct 205 ms 21928 KB Output is correct
40 Correct 194 ms 21848 KB Output is correct
41 Correct 198 ms 21824 KB Output is correct
42 Correct 216 ms 22256 KB Output is correct
43 Correct 190 ms 22316 KB Output is correct
44 Correct 217 ms 22252 KB Output is correct
45 Correct 229 ms 22232 KB Output is correct
46 Correct 216 ms 22224 KB Output is correct
47 Correct 176 ms 21448 KB Output is correct
48 Correct 208 ms 22708 KB Output is correct
49 Correct 197 ms 24332 KB Output is correct
50 Correct 152 ms 23332 KB Output is correct
51 Correct 94 ms 18932 KB Output is correct
52 Correct 203 ms 29188 KB Output is correct
53 Correct 197 ms 21796 KB Output is correct
54 Correct 198 ms 21796 KB Output is correct
55 Correct 171 ms 22244 KB Output is correct
56 Correct 167 ms 21308 KB Output is correct
57 Correct 148 ms 21028 KB Output is correct
58 Correct 2 ms 2644 KB Output is correct
59 Correct 2 ms 2644 KB Output is correct
60 Correct 2 ms 2644 KB Output is correct
61 Correct 1 ms 2644 KB Output is correct
62 Correct 2 ms 2644 KB Output is correct
63 Correct 2 ms 2644 KB Output is correct
64 Correct 2 ms 2644 KB Output is correct
65 Correct 239 ms 30196 KB Output is correct
66 Correct 201 ms 23364 KB Output is correct
67 Correct 230 ms 31140 KB Output is correct
68 Correct 78 ms 18900 KB Output is correct
69 Correct 2 ms 2732 KB Output is correct
70 Correct 2 ms 2644 KB Output is correct
71 Correct 2 ms 2644 KB Output is correct
72 Correct 2 ms 2644 KB Output is correct
73 Correct 2 ms 2644 KB Output is correct
74 Correct 2 ms 2644 KB Output is correct
75 Correct 3 ms 2680 KB Output is correct
76 Correct 2 ms 2688 KB Output is correct
77 Correct 2 ms 2644 KB Output is correct
78 Correct 2 ms 2644 KB Output is correct
79 Correct 2 ms 2644 KB Output is correct
80 Correct 2 ms 2688 KB Output is correct
81 Correct 2 ms 2680 KB Output is correct
82 Correct 2 ms 2644 KB Output is correct
83 Correct 2 ms 2684 KB Output is correct