Submission #890975
Source Code Expand
#include<iostream> #include<iomanip> #include<map> #include<unordered_map> #include<set> #include<unordered_set> #include<vector> #include<array> #include<string> #include<stack> #include<queue> #include<algorithm> #include<cassert> #include<functional> #include<random> #include<complex> //#include<boost/multiprecision/cpp_int.hpp> #define int int64_t #define REP(i, a, b) for (int64_t i = (int64_t)(a); i < (int64_t)(b); i++) #define rep(i, a) REP(i, 0, a) #define EACH(i, a) for (auto i: a) #define ITR(x, a) for (auto x = a.begin(); x != a.end(); x++) #define ALL(a) (a.begin()), (a.end()) #define HAS(a, x) (a.find(x) != a.end()) #define Min(x) *min_element(ALL(x)) #define Max(x) *max_element(ALL(x)) #define Unique(L) (L.erase(unique(ALL(L)), L.end())) using namespace std; //typedef boost::multiprecision::cpp_int bigint; const double EPS = 1e-9; const double PI = acos(-1.0); signed main(void) { cin.tie(0); ios::sync_with_stdio(false); int N; cin >> N; vector<int>a(N); rep(i, N)cin >> a[i]; rep(i, N)a[i]--; int ans = 0; rep(i, N)if (a[a[i]] == i)ans++; cout << ans / 2 << endl; }
Submission Info
Submission Time | |
---|---|
Task | B - Friendly Rabbits |
User | eukaryo |
Language | C++14 (GCC 5.4.1) |
Score | 200 |
Code Size | 1152 Byte |
Status | AC |
Exec Time | 11 ms |
Memory | 1152 KB |
Judge Result
Set Name | Sample | All | ||||
---|---|---|---|---|---|---|
Score / Max Score | 0 / 0 | 200 / 200 | ||||
Status |
|
|
Set Name | Test Cases |
---|---|
Sample | 0_00.txt, 0_01.txt, 0_02.txt |
All | 0_00.txt, 0_01.txt, 0_02.txt, 1_00.txt, 1_01.txt, 1_02.txt, 1_03.txt, 1_04.txt, 1_05.txt, 1_06.txt, 1_07.txt, 1_08.txt, 1_09.txt, 1_10.txt, 1_11.txt |
Case Name | Status | Exec Time | Memory |
---|---|---|---|
0_00.txt | AC | 3 ms | 256 KB |
0_01.txt | AC | 3 ms | 256 KB |
0_02.txt | AC | 3 ms | 256 KB |
1_00.txt | AC | 3 ms | 256 KB |
1_01.txt | AC | 11 ms | 1024 KB |
1_02.txt | AC | 11 ms | 1024 KB |
1_03.txt | AC | 11 ms | 1152 KB |
1_04.txt | AC | 11 ms | 1024 KB |
1_05.txt | AC | 11 ms | 1024 KB |
1_06.txt | AC | 11 ms | 1024 KB |
1_07.txt | AC | 11 ms | 1024 KB |
1_08.txt | AC | 6 ms | 512 KB |
1_09.txt | AC | 10 ms | 896 KB |
1_10.txt | AC | 9 ms | 768 KB |
1_11.txt | AC | 4 ms | 384 KB |