Submission #1353445


Source Code Expand

#include<bits/stdc++.h>
using namespace std;
 
#define REP(i,s,n) for(int i=s;i<n;++i)
#define rep(i,n) REP(i,0,n)
#define SORT(c) sort((c).begin(),(c).end())
#define IINF INT_MAX
#define LLINF LLONG_MAX
 
typedef long long ll;
typedef pair<int, int> ii;

struct UnionFind {
  vector<int> data;
  UnionFind(int v) : data(v, -1) {}
  int root(int x) {
    return data[x] < 0 ? x : data[x] = root(data[x]);
  }
  bool same(int x, int y) {
    return root(x) == root(y);
  }
  int size(int x) {
    return -data[root(x)];
  }
  void merge(int x, int y) {
    x = root(x), y = root(y);
    if (x != y) {
      if (size(y) > size(x))
        swap(x, y);
      data[x] += data[y];
      data[y] = x;
    }
  }
};

int main() {
	
	int n, m;
	cin >> n >> m;
	UnionFind uni(n+1);
	rep(i, m){
		int a, b;
		cin >> a >> b;
		uni.merge(a, b);
	}
	
	set<int> st;
	REP(i, 1, n+1){
		st.insert(uni.root(i));
	}
	
	cout << st.size() - 1 << endl;
	
	return 0;
}

Submission Info

Submission Time
Task B - 道路工事
User letter
Language C++14 (GCC 5.4.1)
Score 100
Code Size 998 Byte
Status AC
Exec Time 63 ms
Memory 7424 KB

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 100 / 100
Status
AC × 2
AC × 22
Set Name Test Cases
Sample sample1.txt, sample2.txt
All 0.txt, 1.txt, 10.txt, 11.txt, 12.txt, 13.txt, 14.txt, 15.txt, 16.txt, 17.txt, 18.txt, 19.txt, 2.txt, 3.txt, 4.txt, 5.txt, 6.txt, 7.txt, 8.txt, 9.txt, sample1.txt, sample2.txt
Case Name Status Exec Time Memory
0.txt AC 1 ms 256 KB
1.txt AC 1 ms 256 KB
10.txt AC 1 ms 256 KB
11.txt AC 1 ms 256 KB
12.txt AC 1 ms 256 KB
13.txt AC 1 ms 256 KB
14.txt AC 1 ms 256 KB
15.txt AC 43 ms 256 KB
16.txt AC 21 ms 5376 KB
17.txt AC 21 ms 5376 KB
18.txt AC 21 ms 7424 KB
19.txt AC 63 ms 1408 KB
2.txt AC 1 ms 256 KB
3.txt AC 1 ms 256 KB
4.txt AC 1 ms 256 KB
5.txt AC 1 ms 256 KB
6.txt AC 1 ms 256 KB
7.txt AC 1 ms 256 KB
8.txt AC 1 ms 256 KB
9.txt AC 1 ms 256 KB
sample1.txt AC 1 ms 256 KB
sample2.txt AC 1 ms 256 KB