Submission #7923169


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#include <iostream>
#include <vector>

using namespace std;
struct UnionFind {
	vector<int> par;

	UnionFind(int N) : par(N) {
		for(int i = 0; i < N; i++) par[i] = i;
	}

	int root(int x) {
		if(par[x] == x) return x;
			//ここで併合処理も行なっている
		return par[x] = root(par[x]);
	}

	void unite(int x, int y) {
		int rx = root(x);
		int ry = root(y);
		if(rx == ry) return;
		par[rx] = ry;
	}

	bool same(int x, int y) {
		int rx = root(x);
		int ry = root(y);
		return rx == ry;
	}

};


int main() {
	int N;
	cin >> N;
	int M;
	cin >> M;
	UnionFind b(M);
	vector<bool> L(M, false);
	for(int i = 0; i < N; i++) {
		int ki;
		cin >> ki;
		int pre_l = -1;
		for(int j = 0; j < ki; j++) {
			int l;
			cin >> l;
			l--;
			L[l] = true;
			if(pre_l == -1) {
				pre_l = l;
				continue;
			}
			b.unite(pre_l, l);
		}
	}
	int f = -1;
	for(int i = 0; i < M; i++) {
		if(L[i] == false) continue;
		if(f == -1){
			f = i;
			continue;
		}
		if(b.same(f, i) == false) {
			cout << "NO" << endl;
			return 0;
		}
	}
		cout << "YES" << endl;
}

Submission Info

Submission Time
Task C - Interpretation
User ssssttttnnnn
Language C++14 (Clang 3.8.0)
Score 400
Code Size 1125 Byte
Status
Exec Time 126 ms
Memory 2048 KB

Judge Result

Set Name sample dataset1 dataset2
Score / Max Score 0 / 0 200 / 200 200 / 200
Status
Test Cases sample-01.txt, sample-02.txt sample-01.txt, sample-02.txt, 01-01.txt, 01-02.txt, 01-03.txt, 01-04.txt, 01-05.txt, 01-06.txt, 01-07.txt, 01-08.txt, 01-09.txt, 01-10.txt sample-01.txt, sample-02.txt, 01-01.txt, 01-02.txt, 01-03.txt, 01-04.txt, 01-05.txt, 01-06.txt, 01-07.txt, 01-08.txt, 01-09.txt, 01-10.txt, 02-01.txt, 02-02.txt, 02-03.txt, 02-04.txt, 02-05.txt, 02-06.txt, 02-07.txt, 02-08.txt, 02-09.txt, 02-10.txt, 02-11.txt, 02-12.txt, 02-13.txt, sample-01.txt, sample-02.txt
Set Name Test Cases
sample sample-01.txt, sample-02.txt
dataset1 sample-01.txt, sample-02.txt, 01-01.txt, 01-02.txt, 01-03.txt, 01-04.txt, 01-05.txt, 01-06.txt, 01-07.txt, 01-08.txt, 01-09.txt, 01-10.txt
dataset2 sample-01.txt, sample-02.txt, 01-01.txt, 01-02.txt, 01-03.txt, 01-04.txt, 01-05.txt, 01-06.txt, 01-07.txt, 01-08.txt, 01-09.txt, 01-10.txt, 02-01.txt, 02-02.txt, 02-03.txt, 02-04.txt, 02-05.txt, 02-06.txt, 02-07.txt, 02-08.txt, 02-09.txt, 02-10.txt, 02-11.txt, 02-12.txt, 02-13.txt, sample-01.txt, sample-02.txt
Case Name Status Exec Time Memory
01-01.txt 1 ms 256 KB
01-02.txt 2 ms 256 KB
01-03.txt 2 ms 256 KB
01-04.txt 2 ms 256 KB
01-05.txt 2 ms 256 KB
01-06.txt 2 ms 256 KB
01-07.txt 2 ms 256 KB
01-08.txt 2 ms 256 KB
01-09.txt 2 ms 256 KB
01-10.txt 2 ms 256 KB
02-01.txt 88 ms 640 KB
02-02.txt 108 ms 256 KB
02-03.txt 89 ms 512 KB
02-04.txt 108 ms 640 KB
02-05.txt 111 ms 256 KB
02-06.txt 108 ms 640 KB
02-07.txt 114 ms 256 KB
02-08.txt 92 ms 256 KB
02-09.txt 126 ms 640 KB
02-10.txt 101 ms 2048 KB
02-11.txt 100 ms 2048 KB
02-12.txt 98 ms 640 KB
02-13.txt 100 ms 640 KB
sample-01.txt 1 ms 256 KB
sample-02.txt 1 ms 256 KB