답안 #106096

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
106096	2019-04-16T13:54:32 Z	mzhao	Mergers (JOI19_mergers)	C++11	10 / 100	33 ms	24064 KB

mergers

#include <bits/stdc++.h>
using namespace std;

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

#define MN 500100
#define x first
#define y second

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

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

void dfs(int n, int p, int d) {
	dep[n] = d;
	par[n] = 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, d+1);
	}
	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;
}

pair<int, int> dp[MN];
pair<int, int> bpos;
int bval;

void dfs2(int n, int p) {
	pair<int, int> b1 = {0, 0}, b2 = {0, 0};
	for (int i : adj[n]) if (i != p) {
		dfs2(i, n);
		if (dp[i].x >= b1.x) {
			b2 = b1;
			b1 = dp[i];
		} else if (dp[i].x >= b2.x) {
			b2 = dp[i];
		}
	}
	if (b2.y && b1.x+b2.x > bval) {
		bval = b1.x+b2.x;
		bpos = {b1.y, b2.y};
	}
	if (b1.x == 0 && bad[n]) {
		b1 = {1, n};
	} else if (bad[n]) {
		b1.x++;
	}
	dp[n] = b1;
}

void rem() {
	int a = bpos.x, b = bpos.y;
	if (dep[a] < dep[b]) swap(a, b);
	while (dep[a] > dep[b]) {
		bad[a] = 0;
		a = par[a];
	}
	while (a != b) {
		bad[a] = bad[b] = 0;
		a = par[a]; b = par[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, 0);
	while (1) {
		for (int j = 1; j <= N; j++) dp[j] = {0, 0};
		bval = 0;
		bpos = {0, 0};
		dfs2(1, 0);
		D("%d %d %d\n", bval, bpos.x, bpos.y);
		if (!bval) {
			if (dp[1].x) ans++;
			break;
		} else {
			rem();
			ans++;
		}
	}
	printf("%d\n", ans);
}

Compilation message

mergers.cpp: In function 'int main()':
mergers.cpp:80:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d", &N, &K);
  ~~~~~^~~~~~~~~~~~~~~~
mergers.cpp:83:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d", &A, &B);
   ~~~~~^~~~~~~~~~~~~~~~
mergers.cpp:88:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &S[i]);
   ~~~~~^~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

#	결과	실행 시간	메모리	Grader output
1	Correct	12 ms	12160 KB	Output is correct
2	Correct	14 ms	12160 KB	Output is correct
3	Correct	13 ms	12288 KB	Output is correct
4	Correct	11 ms	12160 KB	Output is correct
5	Correct	15 ms	12160 KB	Output is correct
6	Correct	14 ms	12160 KB	Output is correct
7	Correct	14 ms	12160 KB	Output is correct
8	Correct	13 ms	12160 KB	Output is correct
9	Correct	13 ms	12160 KB	Output is correct
10	Correct	14 ms	12160 KB	Output is correct
11	Correct	13 ms	12160 KB	Output is correct
12	Correct	13 ms	12160 KB	Output is correct
13	Correct	15 ms	12160 KB	Output is correct
14	Correct	15 ms	12280 KB	Output is correct
15	Correct	14 ms	12160 KB	Output is correct
16	Correct	14 ms	12160 KB	Output is correct
17	Correct	16 ms	12160 KB	Output is correct
18	Correct	13 ms	12160 KB	Output is correct
19	Correct	14 ms	12160 KB	Output is correct
20	Correct	13 ms	12280 KB	Output is correct
21	Correct	14 ms	12160 KB	Output is correct
22	Correct	14 ms	12132 KB	Output is correct
23	Correct	12 ms	12160 KB	Output is correct
24	Correct	13 ms	12160 KB	Output is correct

Subtask #2
0 / 24.0

#	결과	실행 시간	메모리	Grader output
1	Correct	12 ms	12160 KB	Output is correct
2	Correct	14 ms	12160 KB	Output is correct
3	Correct	13 ms	12288 KB	Output is correct
4	Correct	11 ms	12160 KB	Output is correct
5	Correct	15 ms	12160 KB	Output is correct
6	Correct	14 ms	12160 KB	Output is correct
7	Correct	14 ms	12160 KB	Output is correct
8	Correct	13 ms	12160 KB	Output is correct
9	Correct	13 ms	12160 KB	Output is correct
10	Correct	14 ms	12160 KB	Output is correct
11	Correct	13 ms	12160 KB	Output is correct
12	Correct	13 ms	12160 KB	Output is correct
13	Correct	15 ms	12160 KB	Output is correct
14	Correct	15 ms	12280 KB	Output is correct
15	Correct	14 ms	12160 KB	Output is correct
16	Correct	14 ms	12160 KB	Output is correct
17	Correct	16 ms	12160 KB	Output is correct
18	Correct	13 ms	12160 KB	Output is correct
19	Correct	14 ms	12160 KB	Output is correct
20	Correct	13 ms	12280 KB	Output is correct
21	Correct	14 ms	12160 KB	Output is correct
22	Correct	14 ms	12132 KB	Output is correct
23	Correct	12 ms	12160 KB	Output is correct
24	Correct	13 ms	12160 KB	Output is correct
25	Runtime error	33 ms	24056 KB	Execution killed with signal 11 (could be triggered by violating memory limits)
26	Halted	0 ms	0 KB	-

Subtask #3
0 / 14.0

#	결과	실행 시간	메모리	Grader output
1	Correct	12 ms	12160 KB	Output is correct
2	Correct	14 ms	12160 KB	Output is correct
3	Correct	13 ms	12288 KB	Output is correct
4	Correct	11 ms	12160 KB	Output is correct
5	Correct	15 ms	12160 KB	Output is correct
6	Correct	14 ms	12160 KB	Output is correct
7	Correct	14 ms	12160 KB	Output is correct
8	Correct	13 ms	12160 KB	Output is correct
9	Correct	13 ms	12160 KB	Output is correct
10	Correct	14 ms	12160 KB	Output is correct
11	Correct	13 ms	12160 KB	Output is correct
12	Correct	13 ms	12160 KB	Output is correct
13	Correct	15 ms	12160 KB	Output is correct
14	Correct	15 ms	12280 KB	Output is correct
15	Correct	14 ms	12160 KB	Output is correct
16	Correct	14 ms	12160 KB	Output is correct
17	Correct	16 ms	12160 KB	Output is correct
18	Correct	13 ms	12160 KB	Output is correct
19	Correct	14 ms	12160 KB	Output is correct
20	Correct	13 ms	12280 KB	Output is correct
21	Correct	14 ms	12160 KB	Output is correct
22	Correct	14 ms	12132 KB	Output is correct
23	Correct	12 ms	12160 KB	Output is correct
24	Correct	13 ms	12160 KB	Output is correct
25	Runtime error	25 ms	24064 KB	Execution killed with signal 11 (could be triggered by violating memory limits)
26	Halted	0 ms	0 KB	-

Subtask #4
0 / 22.0

#	결과	실행 시간	메모리	Grader output
1	Runtime error	25 ms	24064 KB	Execution killed with signal 11 (could be triggered by violating memory limits)
2	Halted	0 ms	0 KB	-

Subtask #5
0 / 30.0

#	결과	실행 시간	메모리	Grader output
1	Correct	12 ms	12160 KB	Output is correct
2	Correct	14 ms	12160 KB	Output is correct
3	Correct	13 ms	12288 KB	Output is correct
4	Correct	11 ms	12160 KB	Output is correct
5	Correct	15 ms	12160 KB	Output is correct
6	Correct	14 ms	12160 KB	Output is correct
7	Correct	14 ms	12160 KB	Output is correct
8	Correct	13 ms	12160 KB	Output is correct
9	Correct	13 ms	12160 KB	Output is correct
10	Correct	14 ms	12160 KB	Output is correct
11	Correct	13 ms	12160 KB	Output is correct
12	Correct	13 ms	12160 KB	Output is correct
13	Correct	15 ms	12160 KB	Output is correct
14	Correct	15 ms	12280 KB	Output is correct
15	Correct	14 ms	12160 KB	Output is correct
16	Correct	14 ms	12160 KB	Output is correct
17	Correct	16 ms	12160 KB	Output is correct
18	Correct	13 ms	12160 KB	Output is correct
19	Correct	14 ms	12160 KB	Output is correct
20	Correct	13 ms	12280 KB	Output is correct
21	Correct	14 ms	12160 KB	Output is correct
22	Correct	14 ms	12132 KB	Output is correct
23	Correct	12 ms	12160 KB	Output is correct
24	Correct	13 ms	12160 KB	Output is correct
25	Runtime error	33 ms	24056 KB	Execution killed with signal 11 (could be triggered by violating memory limits)
26	Halted	0 ms	0 KB	-

답안 #106096

Compilation message

Subtask #1 10.0 / 10.0

Subtask #2 0 / 24.0

Subtask #3 0 / 14.0

Subtask #4 0 / 22.0

Subtask #5 0 / 30.0

Subtask #1
10.0 / 10.0

Subtask #2
0 / 24.0

Subtask #3
0 / 14.0

Subtask #4
0 / 22.0

Subtask #5
0 / 30.0