Submission #991831


Source Code Expand

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

struct UnionFind {
	vector<int> parent, size;

	UnionFind(int n) : parent(n), size(n, 1) {
		for (int i = 0; i < n; i++) {
			parent[i] = i;
		}
	}

	int operator[](int x) {
		if (parent[x] == x) return x;
		return parent[x] = operator[](parent[x]);
	}

	bool merge(int x, int y) {
		x = operator[](x);
		y = operator[](y);
		if (x == y) return false;
		if (size[x] < size[y]) swap(x, y);
		parent[y] = x;
		size[x] += size[y];
		return true;
	}
};

bool solve() {
	int n, m;
	cin >> n >> m;
	UnionFind uf(n + m);
	for (int i = 0; i < n; i++) {
		int k;
		scanf("%d", &k);
		for (int j = 0; j < k; j++) {
			int l;
			scanf("%d", &l);
			l--;
			uf.merge(i, n + l);
		}
	}
	for (int i = 0; i < n; i++) {
		if (uf[i] != uf[0]) return false;
	}
	return true;
}

int main() {
	puts(solve() ? "YES" : "NO");
}

Submission Info

Submission Time
Task C - Interpretation
User pekempey
Language C++14 (GCC 5.4.1)
Score 400
Code Size 904 Byte
Status AC
Exec Time 21 ms
Memory 1792 KB

Compile Error

./Main.cpp: In function ‘bool solve()’:
./Main.cpp:35:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &k);
                  ^
./Main.cpp:38:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d", &l);
                   ^

Judge Result

Set Name sample dataset1 dataset2
Score / Max Score 0 / 0 200 / 200 200 / 200
Status
AC × 2
AC × 12
AC × 25
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
Case Name Status Exec Time Memory
01-01.txt AC 2 ms 256 KB
01-02.txt AC 2 ms 256 KB
01-03.txt AC 2 ms 256 KB
01-04.txt AC 2 ms 256 KB
01-05.txt AC 2 ms 256 KB
01-06.txt AC 2 ms 256 KB
01-07.txt AC 2 ms 256 KB
01-08.txt AC 2 ms 256 KB
01-09.txt AC 2 ms 256 KB
01-10.txt AC 2 ms 256 KB
02-01.txt AC 15 ms 1024 KB
02-02.txt AC 18 ms 1024 KB
02-03.txt AC 14 ms 640 KB
02-04.txt AC 20 ms 1408 KB
02-05.txt AC 19 ms 896 KB
02-06.txt AC 20 ms 1408 KB
02-07.txt AC 20 ms 1024 KB
02-08.txt AC 18 ms 1024 KB
02-09.txt AC 21 ms 1792 KB
02-10.txt AC 16 ms 1024 KB
02-11.txt AC 16 ms 1024 KB
02-12.txt AC 17 ms 1024 KB
02-13.txt AC 17 ms 1024 KB
sample-01.txt AC 2 ms 256 KB
sample-02.txt AC 2 ms 256 KB