답안 #200398

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
200398	2020-02-06T15:32:28 Z	arnold518	Mergers (JOI19_mergers)	C++14	100 / 100	2067 ms	150648 KB

mergers

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

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

const int MAXN = 5e5;

int N, K;
vector<int> adj[MAXN+10], A[MAXN+10];
int par[MAXN+10][30], dep[MAXN+10];

void dfs(int now, int bef, int d)
{	
	par[now][0]=bef; dep[now]=d;
	for(int nxt : adj[now])
	{
		if(nxt==bef) continue;
		dfs(nxt, now, d+1);
	}
}

int lca(int u, int v)
{
	int i, j;
	if(dep[u]>dep[v]) swap(u, v);
	for(i=20; i>=0; i--) if(dep[par[v][i]]>=dep[u]) v=par[v][i];
	if(u==v) return u;
	for(i=20; i>=0; i--) if(par[v][i]!=par[u][i]) v=par[v][i], u=par[u][i];
	return par[u][0];
}

int B[MAXN+10], ppar[MAXN+10], cnt[MAXN+10], ans;

int Find(int x) { return x==ppar[x] ? x : ppar[x]=Find(ppar[x]); }
void Union(int x, int y) { x=Find(x); y=Find(y); ppar[x]=y; }

void dfs2(int now, int bef)
{
	for(int nxt : adj[now])
	{
		if(nxt==bef) continue;
		dfs2(nxt, now);
		B[now]+=B[nxt];
	}
	if(now!=bef && B[now]) Union(now, bef);
}

int main()
{
	int i, j;

	scanf("%d%d", &N, &K);
	for(i=1; i<=N; i++) ppar[i]=i;
	for(i=1; i<N; i++)
	{
		int u, v;
		scanf("%d%d", &u, &v);
		adj[u].push_back(v);
		adj[v].push_back(u);
	}
	for(i=1; i<=N; i++)
	{
		int t;
		scanf("%d", &t);
		A[t].push_back(i);
	}

	dfs(1, 1, 1);
	for(i=1; i<=20; i++) for(j=1; j<=N; j++) par[j][i]=par[par[j][i-1]][i-1];

	for(i=1; i<=K; i++)
	{
		for(j=1; j<A[i].size(); j++)
		{
			int u=A[i][j-1], v=A[i][j], w=lca(u, v);
			B[u]++; B[v]++; B[w]--; B[w]--;
		}
	}

	dfs2(1, 1);
	for(i=2; i<=N; i++)
	{
		int u=i, v=par[u][0];
		if(Find(u)==Find(v)) continue;
		cnt[Find(u)]++; cnt[Find(v)]++;
	}

	for(i=1; i<=N; i++) if(cnt[i]==1) ans++;
	if(ans==1) ans=0;
	ans++; ans/=2;
	printf("%d", ans);
}

Compilation message

mergers.cpp: In function 'int lca(int, int)':
mergers.cpp:26:9: warning: unused variable 'j' [-Wunused-variable]
  int i, j;
         ^
mergers.cpp: In function 'int main()':
mergers.cpp:75:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(j=1; j<A[i].size(); j++)
            ~^~~~~~~~~~~~
mergers.cpp:54:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d", &N, &K);
  ~~~~~^~~~~~~~~~~~~~~~
mergers.cpp:59:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d", &u, &v);
   ~~~~~^~~~~~~~~~~~~~~~
mergers.cpp:66:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &t);
   ~~~~~^~~~~~~~~~

Subtask #1
10.0 / 10.0

#	결과	실행 시간	메모리	Grader output
1	Correct	20 ms	23800 KB	Output is correct
2	Correct	19 ms	23800 KB	Output is correct
3	Correct	19 ms	23804 KB	Output is correct
4	Correct	19 ms	23800 KB	Output is correct
5	Correct	19 ms	23800 KB	Output is correct
6	Correct	19 ms	23800 KB	Output is correct
7	Correct	20 ms	23800 KB	Output is correct
8	Correct	20 ms	23800 KB	Output is correct
9	Correct	19 ms	23800 KB	Output is correct
10	Correct	19 ms	23800 KB	Output is correct
11	Correct	19 ms	23800 KB	Output is correct
12	Correct	21 ms	23928 KB	Output is correct
13	Correct	19 ms	23800 KB	Output is correct
14	Correct	19 ms	23800 KB	Output is correct
15	Correct	20 ms	23800 KB	Output is correct
16	Correct	19 ms	23800 KB	Output is correct
17	Correct	19 ms	23800 KB	Output is correct
18	Correct	19 ms	23800 KB	Output is correct
19	Correct	19 ms	23800 KB	Output is correct
20	Correct	19 ms	23928 KB	Output is correct
21	Correct	19 ms	23800 KB	Output is correct
22	Correct	19 ms	23672 KB	Output is correct
23	Correct	19 ms	23800 KB	Output is correct
24	Correct	19 ms	23800 KB	Output is correct

Subtask #2
24.0 / 24.0

#	결과	실행 시간	메모리	Grader output
1	Correct	20 ms	23800 KB	Output is correct
2	Correct	19 ms	23800 KB	Output is correct
3	Correct	19 ms	23804 KB	Output is correct
4	Correct	19 ms	23800 KB	Output is correct
5	Correct	19 ms	23800 KB	Output is correct
6	Correct	19 ms	23800 KB	Output is correct
7	Correct	20 ms	23800 KB	Output is correct
8	Correct	20 ms	23800 KB	Output is correct
9	Correct	19 ms	23800 KB	Output is correct
10	Correct	19 ms	23800 KB	Output is correct
11	Correct	19 ms	23800 KB	Output is correct
12	Correct	21 ms	23928 KB	Output is correct
13	Correct	19 ms	23800 KB	Output is correct
14	Correct	19 ms	23800 KB	Output is correct
15	Correct	20 ms	23800 KB	Output is correct
16	Correct	19 ms	23800 KB	Output is correct
17	Correct	19 ms	23800 KB	Output is correct
18	Correct	19 ms	23800 KB	Output is correct
19	Correct	19 ms	23800 KB	Output is correct
20	Correct	19 ms	23928 KB	Output is correct
21	Correct	19 ms	23800 KB	Output is correct
22	Correct	19 ms	23672 KB	Output is correct
23	Correct	19 ms	23800 KB	Output is correct
24	Correct	19 ms	23800 KB	Output is correct
25	Correct	18 ms	23800 KB	Output is correct
26	Correct	22 ms	24440 KB	Output is correct
27	Correct	23 ms	24440 KB	Output is correct
28	Correct	22 ms	24568 KB	Output is correct
29	Correct	21 ms	24440 KB	Output is correct
30	Correct	21 ms	24440 KB	Output is correct
31	Correct	19 ms	23800 KB	Output is correct
32	Correct	21 ms	24568 KB	Output is correct
33	Correct	19 ms	23800 KB	Output is correct
34	Correct	21 ms	24312 KB	Output is correct
35	Correct	22 ms	24440 KB	Output is correct
36	Correct	22 ms	24440 KB	Output is correct
37	Correct	22 ms	24440 KB	Output is correct
38	Correct	19 ms	23928 KB	Output is correct
39	Correct	22 ms	24440 KB	Output is correct
40	Correct	22 ms	24312 KB	Output is correct
41	Correct	22 ms	24312 KB	Output is correct
42	Correct	21 ms	24568 KB	Output is correct
43	Correct	22 ms	24568 KB	Output is correct
44	Correct	20 ms	23800 KB	Output is correct
45	Correct	22 ms	24440 KB	Output is correct
46	Correct	22 ms	24440 KB	Output is correct
47	Correct	19 ms	23800 KB	Output is correct
48	Correct	22 ms	24440 KB	Output is correct
49	Correct	21 ms	24568 KB	Output is correct
50	Correct	22 ms	24440 KB	Output is correct
51	Correct	21 ms	24440 KB	Output is correct
52	Correct	22 ms	24440 KB	Output is correct
53	Correct	22 ms	24440 KB	Output is correct
54	Correct	22 ms	24312 KB	Output is correct

Subtask #3
14.0 / 14.0

#	결과	실행 시간	메모리	Grader output
1	Correct	20 ms	23800 KB	Output is correct
2	Correct	19 ms	23800 KB	Output is correct
3	Correct	19 ms	23804 KB	Output is correct
4	Correct	19 ms	23800 KB	Output is correct
5	Correct	19 ms	23800 KB	Output is correct
6	Correct	19 ms	23800 KB	Output is correct
7	Correct	20 ms	23800 KB	Output is correct
8	Correct	20 ms	23800 KB	Output is correct
9	Correct	19 ms	23800 KB	Output is correct
10	Correct	19 ms	23800 KB	Output is correct
11	Correct	19 ms	23800 KB	Output is correct
12	Correct	21 ms	23928 KB	Output is correct
13	Correct	19 ms	23800 KB	Output is correct
14	Correct	19 ms	23800 KB	Output is correct
15	Correct	20 ms	23800 KB	Output is correct
16	Correct	19 ms	23800 KB	Output is correct
17	Correct	19 ms	23800 KB	Output is correct
18	Correct	19 ms	23800 KB	Output is correct
19	Correct	19 ms	23800 KB	Output is correct
20	Correct	19 ms	23928 KB	Output is correct
21	Correct	19 ms	23800 KB	Output is correct
22	Correct	19 ms	23672 KB	Output is correct
23	Correct	19 ms	23800 KB	Output is correct
24	Correct	19 ms	23800 KB	Output is correct
25	Correct	19 ms	23800 KB	Output is correct
26	Correct	147 ms	42280 KB	Output is correct
27	Correct	196 ms	41952 KB	Output is correct
28	Correct	21 ms	24312 KB	Output is correct
29	Correct	19 ms	23800 KB	Output is correct
30	Correct	19 ms	23800 KB	Output is correct
31	Correct	171 ms	42104 KB	Output is correct
32	Correct	21 ms	24440 KB	Output is correct
33	Correct	245 ms	47608 KB	Output is correct
34	Correct	192 ms	42104 KB	Output is correct
35	Correct	23 ms	24440 KB	Output is correct
36	Correct	207 ms	42548 KB	Output is correct
37	Correct	22 ms	24312 KB	Output is correct
38	Correct	22 ms	24312 KB	Output is correct
39	Correct	142 ms	42264 KB	Output is correct
40	Correct	22 ms	24568 KB	Output is correct
41	Correct	174 ms	41844 KB	Output is correct
42	Correct	265 ms	43896 KB	Output is correct
43	Correct	19 ms	23800 KB	Output is correct
44	Correct	238 ms	47860 KB	Output is correct
45	Correct	246 ms	45048 KB	Output is correct
46	Correct	22 ms	24440 KB	Output is correct
47	Correct	23 ms	24312 KB	Output is correct

Subtask #4
22.0 / 22.0

#	결과	실행 시간	메모리	Grader output
1	Correct	139 ms	40924 KB	Output is correct
2	Correct	120 ms	43376 KB	Output is correct
3	Correct	21 ms	24440 KB	Output is correct
4	Correct	22 ms	24440 KB	Output is correct
5	Correct	19 ms	23804 KB	Output is correct
6	Correct	21 ms	23800 KB	Output is correct
7	Correct	21 ms	24440 KB	Output is correct
8	Correct	183 ms	43640 KB	Output is correct
9	Correct	22 ms	24312 KB	Output is correct
10	Correct	177 ms	42488 KB	Output is correct
11	Correct	19 ms	23800 KB	Output is correct
12	Correct	188 ms	42360 KB	Output is correct
13	Correct	180 ms	43640 KB	Output is correct
14	Correct	156 ms	45304 KB	Output is correct
15	Correct	141 ms	42220 KB	Output is correct
16	Correct	22 ms	24440 KB	Output is correct
17	Correct	19 ms	24056 KB	Output is correct
18	Correct	129 ms	45296 KB	Output is correct
19	Correct	181 ms	48376 KB	Output is correct
20	Correct	22 ms	24440 KB	Output is correct
21	Correct	19 ms	23800 KB	Output is correct
22	Correct	144 ms	43964 KB	Output is correct
23	Correct	22 ms	24440 KB	Output is correct
24	Correct	189 ms	43000 KB	Output is correct
25	Correct	163 ms	47352 KB	Output is correct
26	Correct	21 ms	24440 KB	Output is correct
27	Correct	22 ms	24440 KB	Output is correct
28	Correct	21 ms	24440 KB	Output is correct
29	Correct	22 ms	24440 KB	Output is correct
30	Correct	23 ms	24440 KB	Output is correct

Subtask #5
30.0 / 30.0

#	결과	실행 시간	메모리	Grader output
1	Correct	20 ms	23800 KB	Output is correct
2	Correct	19 ms	23800 KB	Output is correct
3	Correct	19 ms	23804 KB	Output is correct
4	Correct	19 ms	23800 KB	Output is correct
5	Correct	19 ms	23800 KB	Output is correct
6	Correct	19 ms	23800 KB	Output is correct
7	Correct	20 ms	23800 KB	Output is correct
8	Correct	20 ms	23800 KB	Output is correct
9	Correct	19 ms	23800 KB	Output is correct
10	Correct	19 ms	23800 KB	Output is correct
11	Correct	19 ms	23800 KB	Output is correct
12	Correct	21 ms	23928 KB	Output is correct
13	Correct	19 ms	23800 KB	Output is correct
14	Correct	19 ms	23800 KB	Output is correct
15	Correct	20 ms	23800 KB	Output is correct
16	Correct	19 ms	23800 KB	Output is correct
17	Correct	19 ms	23800 KB	Output is correct
18	Correct	19 ms	23800 KB	Output is correct
19	Correct	19 ms	23800 KB	Output is correct
20	Correct	19 ms	23928 KB	Output is correct
21	Correct	19 ms	23800 KB	Output is correct
22	Correct	19 ms	23672 KB	Output is correct
23	Correct	19 ms	23800 KB	Output is correct
24	Correct	19 ms	23800 KB	Output is correct
25	Correct	18 ms	23800 KB	Output is correct
26	Correct	22 ms	24440 KB	Output is correct
27	Correct	23 ms	24440 KB	Output is correct
28	Correct	22 ms	24568 KB	Output is correct
29	Correct	21 ms	24440 KB	Output is correct
30	Correct	21 ms	24440 KB	Output is correct
31	Correct	19 ms	23800 KB	Output is correct
32	Correct	21 ms	24568 KB	Output is correct
33	Correct	19 ms	23800 KB	Output is correct
34	Correct	21 ms	24312 KB	Output is correct
35	Correct	22 ms	24440 KB	Output is correct
36	Correct	22 ms	24440 KB	Output is correct
37	Correct	22 ms	24440 KB	Output is correct
38	Correct	19 ms	23928 KB	Output is correct
39	Correct	22 ms	24440 KB	Output is correct
40	Correct	22 ms	24312 KB	Output is correct
41	Correct	22 ms	24312 KB	Output is correct
42	Correct	21 ms	24568 KB	Output is correct
43	Correct	22 ms	24568 KB	Output is correct
44	Correct	20 ms	23800 KB	Output is correct
45	Correct	22 ms	24440 KB	Output is correct
46	Correct	22 ms	24440 KB	Output is correct
47	Correct	19 ms	23800 KB	Output is correct
48	Correct	22 ms	24440 KB	Output is correct
49	Correct	21 ms	24568 KB	Output is correct
50	Correct	22 ms	24440 KB	Output is correct
51	Correct	21 ms	24440 KB	Output is correct
52	Correct	22 ms	24440 KB	Output is correct
53	Correct	22 ms	24440 KB	Output is correct
54	Correct	22 ms	24312 KB	Output is correct
55	Correct	19 ms	23800 KB	Output is correct
56	Correct	147 ms	42280 KB	Output is correct
57	Correct	196 ms	41952 KB	Output is correct
58	Correct	21 ms	24312 KB	Output is correct
59	Correct	19 ms	23800 KB	Output is correct
60	Correct	19 ms	23800 KB	Output is correct
61	Correct	171 ms	42104 KB	Output is correct
62	Correct	21 ms	24440 KB	Output is correct
63	Correct	245 ms	47608 KB	Output is correct
64	Correct	192 ms	42104 KB	Output is correct
65	Correct	23 ms	24440 KB	Output is correct
66	Correct	207 ms	42548 KB	Output is correct
67	Correct	22 ms	24312 KB	Output is correct
68	Correct	22 ms	24312 KB	Output is correct
69	Correct	142 ms	42264 KB	Output is correct
70	Correct	22 ms	24568 KB	Output is correct
71	Correct	174 ms	41844 KB	Output is correct
72	Correct	265 ms	43896 KB	Output is correct
73	Correct	19 ms	23800 KB	Output is correct
74	Correct	238 ms	47860 KB	Output is correct
75	Correct	246 ms	45048 KB	Output is correct
76	Correct	22 ms	24440 KB	Output is correct
77	Correct	23 ms	24312 KB	Output is correct
78	Correct	139 ms	40924 KB	Output is correct
79	Correct	120 ms	43376 KB	Output is correct
80	Correct	21 ms	24440 KB	Output is correct
81	Correct	22 ms	24440 KB	Output is correct
82	Correct	19 ms	23804 KB	Output is correct
83	Correct	21 ms	23800 KB	Output is correct
84	Correct	21 ms	24440 KB	Output is correct
85	Correct	183 ms	43640 KB	Output is correct
86	Correct	22 ms	24312 KB	Output is correct
87	Correct	177 ms	42488 KB	Output is correct
88	Correct	19 ms	23800 KB	Output is correct
89	Correct	188 ms	42360 KB	Output is correct
90	Correct	180 ms	43640 KB	Output is correct
91	Correct	156 ms	45304 KB	Output is correct
92	Correct	141 ms	42220 KB	Output is correct
93	Correct	22 ms	24440 KB	Output is correct
94	Correct	19 ms	24056 KB	Output is correct
95	Correct	129 ms	45296 KB	Output is correct
96	Correct	181 ms	48376 KB	Output is correct
97	Correct	22 ms	24440 KB	Output is correct
98	Correct	19 ms	23800 KB	Output is correct
99	Correct	144 ms	43964 KB	Output is correct
100	Correct	22 ms	24440 KB	Output is correct
101	Correct	189 ms	43000 KB	Output is correct
102	Correct	163 ms	47352 KB	Output is correct
103	Correct	21 ms	24440 KB	Output is correct
104	Correct	22 ms	24440 KB	Output is correct
105	Correct	21 ms	24440 KB	Output is correct
106	Correct	22 ms	24440 KB	Output is correct
107	Correct	23 ms	24440 KB	Output is correct
108	Correct	869 ms	124388 KB	Output is correct
109	Correct	1916 ms	128816 KB	Output is correct
110	Correct	2067 ms	137776 KB	Output is correct
111	Correct	1250 ms	150648 KB	Output is correct
112	Correct	1165 ms	142764 KB	Output is correct
113	Correct	775 ms	132316 KB	Output is correct
114	Correct	1206 ms	114584 KB	Output is correct
115	Correct	1183 ms	114536 KB	Output is correct
116	Correct	1347 ms	120824 KB	Output is correct
117	Correct	1058 ms	132320 KB	Output is correct
118	Correct	1093 ms	116092 KB	Output is correct
119	Correct	1031 ms	132728 KB	Output is correct
120	Correct	1191 ms	143268 KB	Output is correct
121	Correct	1022 ms	132348 KB	Output is correct
122	Correct	1268 ms	125920 KB	Output is correct
123	Correct	745 ms	132060 KB	Output is correct
124	Correct	1193 ms	130136 KB	Output is correct

답안 #200398

Compilation message

Subtask #1 10.0 / 10.0

Subtask #2 24.0 / 24.0

Subtask #3 14.0 / 14.0

Subtask #4 22.0 / 22.0

Subtask #5 30.0 / 30.0

Subtask #1
10.0 / 10.0

Subtask #2
24.0 / 24.0

Subtask #3
14.0 / 14.0

Subtask #4
22.0 / 22.0

Subtask #5
30.0 / 30.0