Submission #8424271
Source Code Expand
#include <bits/stdc++.h> using namespace std; static const int MAX = 1e5 + 1; // Union-Find木 int par[MAX]; // 親の番号 // n要素で初期化 void init(int n) { for(int i = 0; i < n; i++) par[i] = i; } // 木の根を求める int find(int x) { if(par[x] == x) return x; else return par[x] = find(par[x]); } // xとyが同じ集合に属するか bool same(int x, int y) { return find(x) == find(y); } // xとyの属する集合を併合 void unite(int x, int y) { x = find(x); y = find(y); if(x == y) return; par[x] = y; } int main() { cin.tie(0); ios::sync_with_stdio(false); int n, m; cin >> n >> m; vector<int> p(n); for(int i = 0; i < n; i++) cin >> p.at(i); init(n); int x, y; for(int i = 0; i < m; i++){ cin >> x >> y; unite(x, y); } int ans = 0; for(int i = 0; i < n; i++){ if(same(i + 1, p.at(i))) ans++; } cout << ans << "\n"; }
Submission Info
Submission Time | |
---|---|
Task | D - Equals |
User | hanyu |
Language | C++14 (GCC 5.4.1) |
Score | 400 |
Code Size | 981 Byte |
Status | AC |
Exec Time | 30 ms |
Memory | 1024 KB |
Judge Result
Set Name | Sample | All | ||||
---|---|---|---|---|---|---|
Score / Max Score | 0 / 0 | 400 / 400 | ||||
Status |
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Set Name | Test Cases |
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Sample | 0_000.txt, 0_001.txt, 0_002.txt, 0_003.txt |
All | 0_000.txt, 0_001.txt, 0_002.txt, 0_003.txt, 1_004.txt, 1_005.txt, 1_006.txt, 1_007.txt, 1_008.txt, 1_009.txt, 1_010.txt, 1_011.txt, 1_012.txt, 1_013.txt, 1_014.txt, 1_015.txt, 1_016.txt, 1_017.txt, 1_018.txt, 1_019.txt, 1_020.txt, 1_021.txt, 1_022.txt |
Case Name | Status | Exec Time | Memory |
---|---|---|---|
0_000.txt | AC | 1 ms | 256 KB |
0_001.txt | AC | 1 ms | 256 KB |
0_002.txt | AC | 1 ms | 256 KB |
0_003.txt | AC | 1 ms | 256 KB |
1_004.txt | AC | 15 ms | 256 KB |
1_005.txt | AC | 25 ms | 1024 KB |
1_006.txt | AC | 28 ms | 1024 KB |
1_007.txt | AC | 1 ms | 256 KB |
1_008.txt | AC | 1 ms | 256 KB |
1_009.txt | AC | 1 ms | 256 KB |
1_010.txt | AC | 1 ms | 256 KB |
1_011.txt | AC | 1 ms | 256 KB |
1_012.txt | AC | 1 ms | 256 KB |
1_013.txt | AC | 1 ms | 256 KB |
1_014.txt | AC | 2 ms | 256 KB |
1_015.txt | AC | 1 ms | 256 KB |
1_016.txt | AC | 1 ms | 256 KB |
1_017.txt | AC | 1 ms | 256 KB |
1_018.txt | AC | 14 ms | 256 KB |
1_019.txt | AC | 10 ms | 1024 KB |
1_020.txt | AC | 10 ms | 1024 KB |
1_021.txt | AC | 10 ms | 1024 KB |
1_022.txt | AC | 30 ms | 1024 KB |