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답안 #537298

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
537298 2022-03-14T22:34:48 Z skittles1412 The Xana coup (BOI21_xanadu) C++17
100 / 100
 131 ms 22792 KB 
#include "bits/extc++.h"

using namespace std;

template <typename T>
void dbgh(const T& t) {
	cerr << t << endl;
}

template <typename T, typename... U>
void dbgh(const T& t, const U&... u) {
	cerr << t << " | ";
	dbgh(u...);
}

#ifdef DEBUG
#define dbg(...)                                           \
	cerr << "L" << __LINE__ << " [" << #__VA_ARGS__ << "]" \
		 << ": ";                                          \
	dbgh(__VA_ARGS__)
#else
#define cerr   \
	if (false) \
	cerr
#define dbg(...)
#endif

#define endl "\n"
#define long int64_t
#define sz(x) int((x).size())

const int maxn = 1e5 + 5;

bool arr[maxn];
int memo[maxn][2][2];
vector<int> graph[maxn];

void pdfs(int u) {
	for (auto& v : graph[u]) {
		graph[v].erase(find(begin(graph[v]), end(graph[v]), u));
		pdfs(v);
	}
}

int dp(int u, bool p, bool c) {
	int &ans = memo[u][p][c];
	if (ans != -1) {
		return ans;
	}
	int cdp[2];
	cdp[0] = cdp[1] = 1e9;
	cdp[p ^ c] = 0;
	for (auto& v : graph[u]) {
		int ndp[2];
		for (int i = 0; i < 2; i++) {
			ndp[i] = min({int(1e9), cdp[i] + dp(v, c, false), cdp[i ^ 1] + 1 + dp(v, c, true)});
		}
		cdp[0] = ndp[0];
		cdp[1] = ndp[1];
	}
	return ans = cdp[arr[u]];
}

void solve() {
	int n;
	cin >> n;
	for (int i = 0; i < n - 1; i++) {
		int u, v;
		cin >> u >> v;
		u--;
		v--;
		graph[u].push_back(v);
		graph[v].push_back(u);
	}
	for (int i = 0; i < n; i++) {
		cin >> arr[i];
	}
	pdfs(0);
	memset(memo, -1, sizeof(memo));
	int ans = min(dp(0, false, false), 1 + dp(0, false, true));
	if (ans < int(1e9)) {
		cout << ans << endl;
	} else {
		cout << "impossible" << endl;
	}
}

int main() {
	cin.tie(nullptr);
	ios_base::sync_with_stdio(false);
	cin.exceptions(ios::failbit);
	solve();
}

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 4212 KB Output is correct
2 Correct 3 ms 4208 KB Output is correct
3 Correct 3 ms 4180 KB Output is correct
4 Correct 3 ms 4180 KB Output is correct
5 Correct 2 ms 4208 KB Output is correct

Subtask #2
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 4212 KB Output is correct
2 Correct 3 ms 4208 KB Output is correct
3 Correct 3 ms 4180 KB Output is correct
4 Correct 3 ms 4180 KB Output is correct
5 Correct 2 ms 4208 KB Output is correct
6 Correct 3 ms 4308 KB Output is correct
7 Correct 4 ms 4180 KB Output is correct
8 Correct 3 ms 4180 KB Output is correct
9 Correct 3 ms 4180 KB Output is correct
10 Correct 2 ms 4180 KB Output is correct
11 Correct 3 ms 4180 KB Output is correct
12 Correct 2 ms 4180 KB Output is correct
13 Correct 2 ms 4180 KB Output is correct
14 Correct 3 ms 4180 KB Output is correct
15 Correct 3 ms 4180 KB Output is correct
16 Correct 2 ms 4180 KB Output is correct

Subtask #3
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 72 ms 21512 KB Output is correct
2 Correct 113 ms 22496 KB Output is correct
3 Correct 116 ms 22792 KB Output is correct

Subtask #4
40.0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 71 ms 21432 KB Output is correct
2 Correct 72 ms 22560 KB Output is correct
3 Correct 95 ms 22792 KB Output is correct
4 Correct 109 ms 8268 KB Output is correct
5 Correct 122 ms 8700 KB Output is correct
6 Correct 89 ms 8812 KB Output is correct
7 Correct 3 ms 4180 KB Output is correct
8 Correct 24 ms 5796 KB Output is correct
9 Correct 78 ms 8780 KB Output is correct
10 Correct 110 ms 8956 KB Output is correct
11 Correct 93 ms 9804 KB Output is correct
12 Correct 96 ms 10068 KB Output is correct
13 Correct 63 ms 8396 KB Output is correct
14 Correct 109 ms 8688 KB Output is correct

Subtask #5
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 4212 KB Output is correct
2 Correct 3 ms 4208 KB Output is correct
3 Correct 3 ms 4180 KB Output is correct
4 Correct 3 ms 4180 KB Output is correct
5 Correct 2 ms 4208 KB Output is correct
6 Correct 3 ms 4308 KB Output is correct
7 Correct 4 ms 4180 KB Output is correct
8 Correct 3 ms 4180 KB Output is correct
9 Correct 3 ms 4180 KB Output is correct
10 Correct 2 ms 4180 KB Output is correct
11 Correct 3 ms 4180 KB Output is correct
12 Correct 2 ms 4180 KB Output is correct
13 Correct 2 ms 4180 KB Output is correct
14 Correct 3 ms 4180 KB Output is correct
15 Correct 3 ms 4180 KB Output is correct
16 Correct 2 ms 4180 KB Output is correct
17 Correct 72 ms 21512 KB Output is correct
18 Correct 113 ms 22496 KB Output is correct
19 Correct 116 ms 22792 KB Output is correct
20 Correct 71 ms 21432 KB Output is correct
21 Correct 72 ms 22560 KB Output is correct
22 Correct 95 ms 22792 KB Output is correct
23 Correct 109 ms 8268 KB Output is correct
24 Correct 122 ms 8700 KB Output is correct
25 Correct 89 ms 8812 KB Output is correct
26 Correct 3 ms 4180 KB Output is correct
27 Correct 24 ms 5796 KB Output is correct
28 Correct 78 ms 8780 KB Output is correct
29 Correct 110 ms 8956 KB Output is correct
30 Correct 93 ms 9804 KB Output is correct
31 Correct 96 ms 10068 KB Output is correct
32 Correct 63 ms 8396 KB Output is correct
33 Correct 109 ms 8688 KB Output is correct
34 Correct 2 ms 4208 KB Output is correct
35 Correct 2 ms 4180 KB Output is correct
36 Correct 2 ms 4180 KB Output is correct
37 Correct 2 ms 4180 KB Output is correct
38 Correct 2 ms 4180 KB Output is correct
39 Correct 4 ms 4180 KB Output is correct
40 Correct 2 ms 4216 KB Output is correct
41 Correct 4 ms 4212 KB Output is correct
42 Correct 2 ms 4180 KB Output is correct
43 Correct 2 ms 4180 KB Output is correct
44 Correct 2 ms 4180 KB Output is correct
45 Correct 109 ms 22784 KB Output is correct
46 Correct 87 ms 22516 KB Output is correct
47 Correct 78 ms 22776 KB Output is correct
48 Correct 76 ms 8308 KB Output is correct
49 Correct 110 ms 8616 KB Output is correct
50 Correct 93 ms 8704 KB Output is correct
51 Correct 3 ms 4180 KB Output is correct
52 Correct 27 ms 5836 KB Output is correct
53 Correct 100 ms 8860 KB Output is correct
54 Correct 86 ms 8868 KB Output is correct
55 Correct 84 ms 9812 KB Output is correct
56 Correct 131 ms 10084 KB Output is correct
57 Correct 69 ms 8436 KB Output is correct
58 Correct 68 ms 8740 KB Output is correct
59 Correct 19 ms 5776 KB Output is correct
60 Correct 77 ms 8420 KB Output is correct
61 Correct 116 ms 8816 KB Output is correct
62 Correct 96 ms 8836 KB Output is correct
63 Correct 76 ms 8860 KB Output is correct
64 Correct 80 ms 8876 KB Output is correct
65 Correct 75 ms 9336 KB Output is correct
66 Correct 83 ms 9320 KB Output is correct
67 Correct 54 ms 9200 KB Output is correct
68 Correct 60 ms 9156 KB Output is correct
69 Correct 51 ms 9164 KB Output is correct
70 Correct 57 ms 9144 KB Output is correct