oj.uz

답안 #659976

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
659976 2022-11-20T06:46:22 Z ymm The Xana coup (BOI21_xanadu) C++17
100 / 100
 64 ms 16908 KB 
#include <bits/stdc++.h>
#define Loop(x,l,r) for (ll x = (l); x < (ll)(r); ++x)
#define LoopR(x,l,r) for (ll x = (r)-1; x >= (ll)(l); --x)
typedef long long ll;
typedef std::pair<int, int> pii;
typedef std::pair<ll , ll > pll;
using namespace std;

const int N = 100'010;
vector<int> A[N];
int a[N];
int n;

array<int, 4> dfs(int v, int p)
{
	int mnch[2] = {N, N};
	int sum[2] = {0, 1};
	int s[2] = {a[v], !a[v]};
	for (int u : A[v]) {
		if (u == p)
			continue;
		auto arr = dfs(u, v);
		if (arr[0] < arr[2]) {
			sum[0] += arr[0];
			mnch[0] = min(mnch[0], arr[2]-arr[0]);
		} else {
			sum[0] += arr[2];
			mnch[0] = min(mnch[0], arr[0]-arr[2]);
			s[0] ^= 1;
		}
		if (arr[1] < arr[3]) {
			sum[1] += arr[1];
			mnch[1] = min(mnch[1], arr[3]-arr[1]);
		} else {
			sum[1] += arr[3];
			mnch[1] = min(mnch[1], arr[1]-arr[3]);
			s[1] ^= 1;
		}
	}
	array<int, 4> ans;
	ans[0] = s[0]? sum[0] + mnch[0]: sum[0];
	ans[1] = s[0]? sum[0]: sum[0] + mnch[0];
	ans[2] = s[1]? sum[1] + mnch[1]: sum[1];
	ans[3] = s[1]? sum[1]: sum[1] + mnch[1];
	return ans;
}

int main()
{
	cin.tie(0) -> sync_with_stdio(false);
	cin >> n;
	Loop (i,1,n) {
		int v, u;
		cin >> v >> u;
		--v; --u;
		A[v].push_back(u);
		A[u].push_back(v);
	}
	Loop (i,0,n)
		cin >> a[i];
	auto arr = dfs(0, -1);
	int ans = min(arr[0], arr[2]);
	if (ans >= N)
		cout << "impossible\n";
	else
		cout << ans << '\n';
}

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 2644 KB Output is correct
2 Correct 2 ms 2644 KB Output is correct
3 Correct 1 ms 2644 KB Output is correct
4 Correct 2 ms 2680 KB Output is correct
5 Correct 2 ms 2676 KB Output is correct

Subtask #2
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 2644 KB Output is correct
2 Correct 2 ms 2644 KB Output is correct
3 Correct 1 ms 2644 KB Output is correct
4 Correct 2 ms 2680 KB Output is correct
5 Correct 2 ms 2676 KB Output is correct
6 Correct 2 ms 2644 KB Output is correct
7 Correct 2 ms 2680 KB Output is correct
8 Correct 2 ms 2644 KB Output is correct
9 Correct 2 ms 2672 KB Output is correct
10 Correct 2 ms 2644 KB Output is correct
11 Correct 2 ms 2676 KB Output is correct
12 Correct 2 ms 2644 KB Output is correct
13 Correct 2 ms 2676 KB Output is correct
14 Correct 2 ms 2676 KB Output is correct
15 Correct 2 ms 2644 KB Output is correct
16 Correct 2 ms 2644 KB Output is correct

Subtask #3
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 49 ms 16724 KB Output is correct
2 Correct 64 ms 16672 KB Output is correct
3 Correct 44 ms 16896 KB Output is correct

Subtask #4
40.0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 44 ms 16820 KB Output is correct
2 Correct 58 ms 16648 KB Output is correct
3 Correct 53 ms 16908 KB Output is correct
4 Correct 41 ms 7140 KB Output is correct
5 Correct 40 ms 7328 KB Output is correct
6 Correct 45 ms 7468 KB Output is correct
7 Correct 2 ms 2644 KB Output is correct
8 Correct 14 ms 4308 KB Output is correct
9 Correct 40 ms 7500 KB Output is correct
10 Correct 42 ms 7552 KB Output is correct
11 Correct 48 ms 8112 KB Output is correct
12 Correct 43 ms 8332 KB Output is correct
13 Correct 58 ms 7116 KB Output is correct
14 Correct 40 ms 7524 KB Output is correct

Subtask #5
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 2644 KB Output is correct
2 Correct 2 ms 2644 KB Output is correct
3 Correct 1 ms 2644 KB Output is correct
4 Correct 2 ms 2680 KB Output is correct
5 Correct 2 ms 2676 KB Output is correct
6 Correct 2 ms 2644 KB Output is correct
7 Correct 2 ms 2680 KB Output is correct
8 Correct 2 ms 2644 KB Output is correct
9 Correct 2 ms 2672 KB Output is correct
10 Correct 2 ms 2644 KB Output is correct
11 Correct 2 ms 2676 KB Output is correct
12 Correct 2 ms 2644 KB Output is correct
13 Correct 2 ms 2676 KB Output is correct
14 Correct 2 ms 2676 KB Output is correct
15 Correct 2 ms 2644 KB Output is correct
16 Correct 2 ms 2644 KB Output is correct
17 Correct 49 ms 16724 KB Output is correct
18 Correct 64 ms 16672 KB Output is correct
19 Correct 44 ms 16896 KB Output is correct
20 Correct 44 ms 16820 KB Output is correct
21 Correct 58 ms 16648 KB Output is correct
22 Correct 53 ms 16908 KB Output is correct
23 Correct 41 ms 7140 KB Output is correct
24 Correct 40 ms 7328 KB Output is correct
25 Correct 45 ms 7468 KB Output is correct
26 Correct 2 ms 2644 KB Output is correct
27 Correct 14 ms 4308 KB Output is correct
28 Correct 40 ms 7500 KB Output is correct
29 Correct 42 ms 7552 KB Output is correct
30 Correct 48 ms 8112 KB Output is correct
31 Correct 43 ms 8332 KB Output is correct
32 Correct 58 ms 7116 KB Output is correct
33 Correct 40 ms 7524 KB Output is correct
34 Correct 2 ms 2644 KB Output is correct
35 Correct 2 ms 2644 KB Output is correct
36 Correct 1 ms 2684 KB Output is correct
37 Correct 2 ms 2644 KB Output is correct
38 Correct 2 ms 2644 KB Output is correct
39 Correct 1 ms 2644 KB Output is correct
40 Correct 2 ms 2644 KB Output is correct
41 Correct 2 ms 2644 KB Output is correct
42 Correct 2 ms 2644 KB Output is correct
43 Correct 2 ms 2644 KB Output is correct
44 Correct 2 ms 2644 KB Output is correct
45 Correct 44 ms 16844 KB Output is correct
46 Correct 42 ms 16656 KB Output is correct
47 Correct 46 ms 16908 KB Output is correct
48 Correct 36 ms 6900 KB Output is correct
49 Correct 40 ms 7368 KB Output is correct
50 Correct 41 ms 7488 KB Output is correct
51 Correct 2 ms 2644 KB Output is correct
52 Correct 17 ms 4308 KB Output is correct
53 Correct 42 ms 7532 KB Output is correct
54 Correct 43 ms 7564 KB Output is correct
55 Correct 41 ms 8152 KB Output is correct
56 Correct 45 ms 8296 KB Output is correct
57 Correct 45 ms 7156 KB Output is correct
58 Correct 41 ms 7528 KB Output is correct
59 Correct 14 ms 4296 KB Output is correct
60 Correct 38 ms 7100 KB Output is correct
61 Correct 45 ms 7412 KB Output is correct
62 Correct 45 ms 7728 KB Output is correct
63 Correct 43 ms 7644 KB Output is correct
64 Correct 40 ms 7560 KB Output is correct
65 Correct 35 ms 8012 KB Output is correct
66 Correct 35 ms 8088 KB Output is correct
67 Correct 33 ms 7920 KB Output is correct
68 Correct 33 ms 7940 KB Output is correct
69 Correct 31 ms 7856 KB Output is correct
70 Correct 31 ms 7876 KB Output is correct