Submission #891111
Source Code Expand
#include <bits/stdc++.h> using namespace std; using ll = long long; using ld = long double; using vi = vector<int>; using vvi = vector<vi>; using vb = vector<bool>; using vvb = vector<vb>; using vl = vector<ll>; using vvl = vector<vl>; using vd = vector<double>; using vvd = vector<vd>; #define REP(i,n) for(ll i=0, i##_len=(ll)(n); i<i##_len; ++i) #define ALL(c) (c).begin(), (c).end() #define FOR(i,s,n) for(ll i=s, i##_len=(ll)(n); i<i##_len; ++i) #define TEN(x) ((ll)1e##x) const ll mod = TEN(9) + 7; int main() { #ifdef INPUT_FROM_FILE ifstream cin("sample.in"); ofstream cout("sample.out"); #endif cin.tie(0); ios_base::sync_with_stdio(false); cout << fixed << setprecision(50); ll n; cin >> n; vl a(n); REP(i, n) cin >> a[i]; ll sum = 0; REP(i, n) if (i == a[a[i]-1]-1) sum++; cout << sum / 2 << endl; return 0; }
Submission Info
Submission Time | |
---|---|
Task | B - Friendly Rabbits |
User | takamoto |
Language | C++14 (GCC 5.4.1) |
Score | 200 |
Code Size | 878 Byte |
Status | AC |
Exec Time | 11 ms |
Memory | 1024 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 | 384 KB |
0_01.txt | AC | 2 ms | 256 KB |
0_02.txt | AC | 3 ms | 256 KB |
1_00.txt | AC | 2 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 | 1024 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 |