oj.uz

답안 #120619

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
120619 2019-06-25T05:49:03 Z 임유진(#2961) Mergers (JOI19_mergers) C++14
0 / 100
 149 ms 55852 KB 
#include<stdio.h>
#include<queue>
#include<vector>
#include<algorithm>

using namespace std;

#define MAXN 500005

int A[MAXN], B[MAXN], S[MAXN];
vector<int> e[MAXN];
int par[20][MAXN], dep[MAXN];
vector<int> ss[MAXN];
bool chkn[MAXN], chks[MAXN];
queue<int> q;
int gs[MAXN];
vector<int> ge[MAXN];

void dfs(int x){
	for(auto a:e[x]) if(a!=par[0][x]){
		par[0][a]=x;
		dep[a]=dep[x]+1;
		dfs(a);
	}
}

int anc(int x, int d){
	if(d>dep[x]) return 0;
	for(int i=19; i>=0; i--) if((dep[x]-d)&(1<<i)) x=par[i][x];
	return x;
}

int lca(int x, int y){
	if(dep[x]>dep[y]) x=anc(x, dep[y]);
	else y=anc(y, dep[x]);
	if(x==y) return x;
	for(int i=19; i>=0; i--) if(par[i][x]!=par[i][y]){
		x=par[i][x];
		y=par[i][y];
	}
	return par[0][x];
}

int main(){
	int N, K;
	int ans=0;

	scanf("%d%d", &N, &K);
	for(int i=0; i<N-1; i++) scanf("%d%d", A+i, B+i);
	for(int i=1; i<=N; i++) scanf("%d", S+i);

	for(int i=0; i<N-1; i++){
		e[A[i]].push_back(B[i]);
		e[B[i]].push_back(A[i]);
	}
	par[0][1]=1;
	dfs(1);
	for(int i=1; i<20; i++) for(int j=1; j<=N; j++) par[i][j]=par[i-1][par[i-1][j]];
	//for(int i=1; i<=N; i++) printf("%d %d %d\n", par[0][i], par[1][i], par[2][i]);
	for(int i=1; i<=N; i++) ss[S[i]].push_back(i);
	//for(int i=1; i<=K; i++) printf("%d\n", ss[i].size());
	
	for(int i=1; i<=K; i++) if(!chks[i]){
		chks[i]=true;
		q.push(i);
		//printf("[%d]\n", i);
		while(!q.empty()){
			int t=q.front();
			q.pop();
			gs[t]=i;
			int l=ss[t][0];
			for(auto a:ss[t]) l=lca(l, a);
			//printf("lca=%d\n", l);
			for(auto a:ss[t]) for(int j=a; dep[j]>=dep[l]&&!chkn[j]; j=par[0][j]){
				chkn[j]=true;
				if(!chks[S[j]]){
					chks[S[j]]=true;
					q.push(S[j]);
				}
			}
		}
	}

	//for(int i=1; i<=K; i++) printf("%d ", gs[i]);

	for(int i=0; i<N-1; i++) if(gs[S[A[i]]]!=gs[S[B[i]]]){
		ge[S[A[i]]].push_back(S[B[i]]);
		ge[S[B[i]]].push_back(S[A[i]]);
	}
	for(int i=1; i<=K; i++){
		unique(ge[i].begin(), ge[i].end());
		if(ge[i].size()==1) ans++;
	}

	printf("%d", (ans+1)/2);
	return 0;
}

Compilation message

mergers.cpp: In function 'int main()':
mergers.cpp:48:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d", &N, &K);
  ~~~~~^~~~~~~~~~~~~~~~
mergers.cpp:49:32: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for(int i=0; i<N-1; i++) scanf("%d%d", A+i, B+i);
                           ~~~~~^~~~~~~~~~~~~~~~~~
mergers.cpp:50:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for(int i=1; i<=N; i++) scanf("%d", S+i);
                          ~~~~~^~~~~~~~~~~

Subtask #1
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 34 ms 35704 KB Output is correct
2 Correct 34 ms 35832 KB Output is correct
3 Correct 35 ms 35832 KB Output is correct
4 Correct 34 ms 35776 KB Output is correct
5 Correct 32 ms 35708 KB Output is correct
6 Correct 32 ms 35712 KB Output is correct
7 Correct 32 ms 35704 KB Output is correct
8 Correct 36 ms 35816 KB Output is correct
9 Correct 33 ms 35704 KB Output is correct
10 Correct 34 ms 35712 KB Output is correct
11 Correct 37 ms 35840 KB Output is correct
12 Correct 34 ms 35704 KB Output is correct
13 Correct 33 ms 35676 KB Output is correct
14 Correct 33 ms 35704 KB Output is correct
15 Correct 33 ms 35792 KB Output is correct
16 Correct 32 ms 35712 KB Output is correct
17 Correct 32 ms 35712 KB Output is correct
18 Correct 31 ms 35840 KB Output is correct
19 Correct 32 ms 35712 KB Output is correct
20 Correct 33 ms 35676 KB Output is correct
21 Correct 33 ms 35812 KB Output is correct
22 Correct 32 ms 35704 KB Output is correct
23 Incorrect 32 ms 35704 KB Output isn't correct
24 Halted 0 ms 0 KB -

Subtask #2
0 / 24.0

# 결과 실행 시간 메모리 Grader output
1 Correct 34 ms 35704 KB Output is correct
2 Correct 34 ms 35832 KB Output is correct
3 Correct 35 ms 35832 KB Output is correct
4 Correct 34 ms 35776 KB Output is correct
5 Correct 32 ms 35708 KB Output is correct
6 Correct 32 ms 35712 KB Output is correct
7 Correct 32 ms 35704 KB Output is correct
8 Correct 36 ms 35816 KB Output is correct
9 Correct 33 ms 35704 KB Output is correct
10 Correct 34 ms 35712 KB Output is correct
11 Correct 37 ms 35840 KB Output is correct
12 Correct 34 ms 35704 KB Output is correct
13 Correct 33 ms 35676 KB Output is correct
14 Correct 33 ms 35704 KB Output is correct
15 Correct 33 ms 35792 KB Output is correct
16 Correct 32 ms 35712 KB Output is correct
17 Correct 32 ms 35712 KB Output is correct
18 Correct 31 ms 35840 KB Output is correct
19 Correct 32 ms 35712 KB Output is correct
20 Correct 33 ms 35676 KB Output is correct
21 Correct 33 ms 35812 KB Output is correct
22 Correct 32 ms 35704 KB Output is correct
23 Incorrect 32 ms 35704 KB Output isn't correct
24 Halted 0 ms 0 KB -

Subtask #3
0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Correct 34 ms 35704 KB Output is correct
2 Correct 34 ms 35832 KB Output is correct
3 Correct 35 ms 35832 KB Output is correct
4 Correct 34 ms 35776 KB Output is correct
5 Correct 32 ms 35708 KB Output is correct
6 Correct 32 ms 35712 KB Output is correct
7 Correct 32 ms 35704 KB Output is correct
8 Correct 36 ms 35816 KB Output is correct
9 Correct 33 ms 35704 KB Output is correct
10 Correct 34 ms 35712 KB Output is correct
11 Correct 37 ms 35840 KB Output is correct
12 Correct 34 ms 35704 KB Output is correct
13 Correct 33 ms 35676 KB Output is correct
14 Correct 33 ms 35704 KB Output is correct
15 Correct 33 ms 35792 KB Output is correct
16 Correct 32 ms 35712 KB Output is correct
17 Correct 32 ms 35712 KB Output is correct
18 Correct 31 ms 35840 KB Output is correct
19 Correct 32 ms 35712 KB Output is correct
20 Correct 33 ms 35676 KB Output is correct
21 Correct 33 ms 35812 KB Output is correct
22 Correct 32 ms 35704 KB Output is correct
23 Incorrect 32 ms 35704 KB Output isn't correct
24 Halted 0 ms 0 KB -

Subtask #4
0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 93 ms 50516 KB Output is correct
2 Correct 135 ms 55852 KB Output is correct
3 Correct 34 ms 36224 KB Output is correct
4 Correct 35 ms 36224 KB Output is correct
5 Correct 31 ms 35796 KB Output is correct
6 Correct 31 ms 35712 KB Output is correct
7 Correct 34 ms 36224 KB Output is correct
8 Incorrect 149 ms 51752 KB Output isn't correct
9 Halted 0 ms 0 KB -

Subtask #5
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 34 ms 35704 KB Output is correct
2 Correct 34 ms 35832 KB Output is correct
3 Correct 35 ms 35832 KB Output is correct
4 Correct 34 ms 35776 KB Output is correct
5 Correct 32 ms 35708 KB Output is correct
6 Correct 32 ms 35712 KB Output is correct
7 Correct 32 ms 35704 KB Output is correct
8 Correct 36 ms 35816 KB Output is correct
9 Correct 33 ms 35704 KB Output is correct
10 Correct 34 ms 35712 KB Output is correct
11 Correct 37 ms 35840 KB Output is correct
12 Correct 34 ms 35704 KB Output is correct
13 Correct 33 ms 35676 KB Output is correct
14 Correct 33 ms 35704 KB Output is correct
15 Correct 33 ms 35792 KB Output is correct
16 Correct 32 ms 35712 KB Output is correct
17 Correct 32 ms 35712 KB Output is correct
18 Correct 31 ms 35840 KB Output is correct
19 Correct 32 ms 35712 KB Output is correct
20 Correct 33 ms 35676 KB Output is correct
21 Correct 33 ms 35812 KB Output is correct
22 Correct 32 ms 35704 KB Output is correct
23 Incorrect 32 ms 35704 KB Output isn't correct
24 Halted 0 ms 0 KB -