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답안 #529635

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
529635 2022-02-23T09:36:39 Z hohohaha The Xana coup (BOI21_xanadu) C++14
100 / 100
 82 ms 21188 KB 
#include<bits/stdc++.h> 
using namespace std; 

#define fori(i, a, b) for(int i = (int) (a); i <= (int) (b); i++) 
#define ford(i, a, b) for(int i = (int) (a); i >= (int) (b); i--) 
#define ii pair<int, int> 
#define fi first
#define se second
#define vi vector<int> 
#define eb emplace_back
#define sp ' ' 
#define endl '\n'
#define int long long

const int maxn = 2e5 + 5, inf = LLONG_MAX / 100ll; 
int n; 
vi g[maxn]; 
int ini[maxn]; 
int dp[maxn][2][2]; 
int nw[2][2]; 
void dfs(int u, int p ) { 
	dp[u][ini[u]][0] = 0;
	dp[u][ini[u] ^ 1][1] = 1; 
	for(int v: g[u]) { 
		if(v - p) { 
			dfs(v, u);
			fori(s, 0, 1) fori(var, 0, 1) nw[s][var] = inf; 
			fori(var, 0, 1) { 
				fori(s, 0, 1) { 
					fori(var_v, 0, 1) { 	
						nw[s ^ var_v][var] = min(nw[s ^ var_v][var], dp[u][s][var] + dp[v][var][var_v]);
					}
				}
			}
			fori(s, 0, 1) fori(var, 0, 1) dp[u][s][var] = nw[s][var]; 
		}
	}
//	fori(s, 0, 1) { 
//		fori(var, 0, 1) { 
//			cout << u << sp << s << sp << var << sp << dp[u][s][var] << endl; 
//		}
//	}
}
signed main() { 
	ios_base::sync_with_stdio(0); 
	cin.tie(0); 
	cout.tie(0);  
	cin >> n; 
	fori(i, 1, n - 1) { 
		int u, v; 
		cin >> u >> v; 
		g[u].eb(v); g[v].eb(u); 
	}
	fori(i, 1, n) cin >> ini[i]; 
	fori(i, 1, n) { 
		fori(s, 0, 1) { 
			fori(var, 0, 1) { 
				dp[i][s][var] = inf; 
			}
		}
	}
	dfs(1, 1); 
	int ans = min(dp[1][0][0], dp[1][0][1]); 
	if(ans == inf) { 
		cout << "impossible" << endl; 
	}
	else cout << ans; 
}

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4940 KB Output is correct
2 Correct 3 ms 4940 KB Output is correct
3 Correct 2 ms 4944 KB Output is correct
4 Correct 3 ms 4940 KB Output is correct
5 Correct 3 ms 4988 KB Output is correct

Subtask #2
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4940 KB Output is correct
2 Correct 3 ms 4940 KB Output is correct
3 Correct 2 ms 4944 KB Output is correct
4 Correct 3 ms 4940 KB Output is correct
5 Correct 3 ms 4988 KB Output is correct
6 Correct 4 ms 5016 KB Output is correct
7 Correct 3 ms 5016 KB Output is correct
8 Correct 4 ms 4940 KB Output is correct
9 Correct 3 ms 5016 KB Output is correct
10 Correct 3 ms 4940 KB Output is correct
11 Correct 3 ms 4940 KB Output is correct
12 Correct 3 ms 4940 KB Output is correct
13 Correct 3 ms 4940 KB Output is correct
14 Correct 3 ms 5020 KB Output is correct
15 Correct 3 ms 5020 KB Output is correct
16 Correct 3 ms 5016 KB Output is correct

Subtask #3
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 54 ms 21136 KB Output is correct
2 Correct 71 ms 20888 KB Output is correct
3 Correct 55 ms 21188 KB Output is correct

Subtask #4
40.0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 60 ms 21128 KB Output is correct
2 Correct 49 ms 20908 KB Output is correct
3 Correct 69 ms 21140 KB Output is correct
4 Correct 49 ms 13288 KB Output is correct
5 Correct 60 ms 14204 KB Output is correct
6 Correct 69 ms 14192 KB Output is correct
7 Correct 3 ms 5068 KB Output is correct
8 Correct 17 ms 8012 KB Output is correct
9 Correct 54 ms 13852 KB Output is correct
10 Correct 62 ms 13968 KB Output is correct
11 Correct 59 ms 14276 KB Output is correct
12 Correct 54 ms 14560 KB Output is correct
13 Correct 48 ms 13960 KB Output is correct
14 Correct 56 ms 14588 KB Output is correct

Subtask #5
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4940 KB Output is correct
2 Correct 3 ms 4940 KB Output is correct
3 Correct 2 ms 4944 KB Output is correct
4 Correct 3 ms 4940 KB Output is correct
5 Correct 3 ms 4988 KB Output is correct
6 Correct 4 ms 5016 KB Output is correct
7 Correct 3 ms 5016 KB Output is correct
8 Correct 4 ms 4940 KB Output is correct
9 Correct 3 ms 5016 KB Output is correct
10 Correct 3 ms 4940 KB Output is correct
11 Correct 3 ms 4940 KB Output is correct
12 Correct 3 ms 4940 KB Output is correct
13 Correct 3 ms 4940 KB Output is correct
14 Correct 3 ms 5020 KB Output is correct
15 Correct 3 ms 5020 KB Output is correct
16 Correct 3 ms 5016 KB Output is correct
17 Correct 54 ms 21136 KB Output is correct
18 Correct 71 ms 20888 KB Output is correct
19 Correct 55 ms 21188 KB Output is correct
20 Correct 60 ms 21128 KB Output is correct
21 Correct 49 ms 20908 KB Output is correct
22 Correct 69 ms 21140 KB Output is correct
23 Correct 49 ms 13288 KB Output is correct
24 Correct 60 ms 14204 KB Output is correct
25 Correct 69 ms 14192 KB Output is correct
26 Correct 3 ms 5068 KB Output is correct
27 Correct 17 ms 8012 KB Output is correct
28 Correct 54 ms 13852 KB Output is correct
29 Correct 62 ms 13968 KB Output is correct
30 Correct 59 ms 14276 KB Output is correct
31 Correct 54 ms 14560 KB Output is correct
32 Correct 48 ms 13960 KB Output is correct
33 Correct 56 ms 14588 KB Output is correct
34 Correct 3 ms 4940 KB Output is correct
35 Correct 4 ms 4940 KB Output is correct
36 Correct 4 ms 5020 KB Output is correct
37 Correct 3 ms 4940 KB Output is correct
38 Correct 3 ms 5068 KB Output is correct
39 Correct 3 ms 4940 KB Output is correct
40 Correct 3 ms 4940 KB Output is correct
41 Correct 3 ms 4940 KB Output is correct
42 Correct 3 ms 4940 KB Output is correct
43 Correct 3 ms 5012 KB Output is correct
44 Correct 3 ms 4940 KB Output is correct
45 Correct 48 ms 21120 KB Output is correct
46 Correct 46 ms 20852 KB Output is correct
47 Correct 48 ms 21104 KB Output is correct
48 Correct 47 ms 13304 KB Output is correct
49 Correct 62 ms 13976 KB Output is correct
50 Correct 82 ms 14256 KB Output is correct
51 Correct 3 ms 4940 KB Output is correct
52 Correct 23 ms 7980 KB Output is correct
53 Correct 57 ms 13776 KB Output is correct
54 Correct 54 ms 13924 KB Output is correct
55 Correct 55 ms 14204 KB Output is correct
56 Correct 69 ms 14700 KB Output is correct
57 Correct 61 ms 13864 KB Output is correct
58 Correct 64 ms 14552 KB Output is correct
59 Correct 15 ms 7912 KB Output is correct
60 Correct 43 ms 12996 KB Output is correct
61 Correct 58 ms 13788 KB Output is correct
62 Correct 59 ms 13908 KB Output is correct
63 Correct 58 ms 13960 KB Output is correct
64 Correct 53 ms 13928 KB Output is correct
65 Correct 46 ms 14420 KB Output is correct
66 Correct 63 ms 14340 KB Output is correct
67 Correct 43 ms 14144 KB Output is correct
68 Correct 46 ms 14160 KB Output is correct
69 Correct 38 ms 14120 KB Output is correct
70 Correct 44 ms 14188 KB Output is correct