Contest Duration: ~ (local time) (180 minutes)

Submission #7923169

Source Code Expand

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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 2019-10-10 09:20:18+0900 C - Interpretation ssssttttnnnn C++14 (Clang 3.8.0) 400 1125 Byte AC 126 ms 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