oj.uz

Submission #106085

# Submission time Handle Problem Language Result Execution time Memory
106085 2019-04-16T13:35:28 Z mzhao Mergers (JOI19_mergers) C++11
0 / 100
 34 ms 24032 KB 
#include <bits/stdc++.h>
using namespace std;

#ifdef DEBUG
#define D(x...) printf(x)
#else
#define D(x...)
#endif

#define MN 500100

int N, K, S[MN];
vector<int> adj[MN];

int tot[MN], cnt[MN], ans;
bool bad[MN];

void dfs(int n, int p) {
	int cur[8];
	for (int i = 1; i <= K; i++) cur[i] = cnt[i];
	cnt[S[n]]++;
	for (int i : adj[n]) if (i != p) {
		dfs(i, n);
	}
	for (int i = 1; i <= K; i++) cur[i] = cnt[i]-cur[i];
	if (n == 1) return;
	bool f = 1;
	for (int i = 1; i <= K; i++) if (cur[i] && cur[i] != tot[i]) {
		f = 0;
		break;
	}
	bad[n] = f;
}

void dfs2(int n, int p, bool b) {
	b |= bad[n];
	if (adj[n].size() == 1 && n != 1) {
		ans += b;
		return;
	}
	for (int i : adj[n]) if (i != p) dfs2(i, n, b);
}

int main() {
	scanf("%d%d", &N, &K);
	assert(N <= 100);
	for (int i = 1, A, B; i < N; i++) {
		scanf("%d%d", &A, &B);
		adj[A].push_back(B);
		adj[B].push_back(A);
	}
	for (int i = 1; i <= N; i++) {
		scanf("%d", &S[i]);
		tot[S[i]]++;
	}
	dfs(1, 0);
	for (int i = 1; i <= N; i++) D("%d", bad[i]);
	D("\n");
	dfs2(1, 0, 0);
	printf("%d\n", (ans+1)/2);
}

Compilation message

mergers.cpp: In function 'int main()':
mergers.cpp:45:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d", &N, &K);
  ~~~~~^~~~~~~~~~~~~~~~
mergers.cpp:48:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d", &A, &B);
   ~~~~~^~~~~~~~~~~~~~~~
mergers.cpp:53:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &S[i]);
   ~~~~~^~~~~~~~~~~~~

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 12060 KB Output is correct
2 Incorrect 15 ms 12032 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 12060 KB Output is correct
2 Incorrect 15 ms 12032 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #3
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 12060 KB Output is correct
2 Incorrect 15 ms 12032 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #4
0 / 22.0

# Verdict Execution time Memory Grader output
1 Runtime error 34 ms 24032 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #5
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 12060 KB Output is correct
2 Incorrect 15 ms 12032 KB Output isn't correct
3 Halted 0 ms 0 KB -