Submission #2127723
Source Code Expand
// #include {{{ #include <iostream> #include <cassert> #include <cstring> #include <cstdlib> #include <cstdio> #include <cctype> #include <cmath> #include <ctime> #include <queue> #include <set> #include <map> #include <stack> #include <string> #include <bitset> #include <vector> #include <complex> #include <algorithm> using namespace std; // }}} // #define {{{ typedef long long ll; typedef double db; typedef pair<int,int> pii; typedef vector<int> vi; #define de(x) cout << #x << "=" << x << endl #define rep(i,a,b) for(int i=a;i<(b);++i) #define per(i,a,b) for(int i=(b)-1;i>=(a);--i) #define all(x) (x).begin(),(x).end() #define sz(x) (int)(x).size() #define mp make_pair #define pb push_back #define fi first #define se second // }}} const int N = 1e5 + 10; int a[N] , n; int main(){ cin >> n; rep(i,1,n+1) cin >> a[i]; int ans = 0; rep(i,1,n+1) if(a[i] != i) ans += a[a[i]] == i; cout << ans / 2 << endl; return 0; }
Submission Info
Submission Time | |
---|---|
Task | B - Friendly Rabbits |
User | Y_UME |
Language | C++14 (GCC 5.4.1) |
Score | 200 |
Code Size | 986 Byte |
Status | AC |
Exec Time | 36 ms |
Memory | 640 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 | 1 ms | 256 KB |
0_01.txt | AC | 1 ms | 256 KB |
0_02.txt | AC | 1 ms | 256 KB |
1_00.txt | AC | 1 ms | 256 KB |
1_01.txt | AC | 36 ms | 640 KB |
1_02.txt | AC | 36 ms | 640 KB |
1_03.txt | AC | 36 ms | 640 KB |
1_04.txt | AC | 36 ms | 640 KB |
1_05.txt | AC | 36 ms | 640 KB |
1_06.txt | AC | 36 ms | 640 KB |
1_07.txt | AC | 36 ms | 640 KB |
1_08.txt | AC | 14 ms | 384 KB |
1_09.txt | AC | 30 ms | 512 KB |
1_10.txt | AC | 25 ms | 512 KB |
1_11.txt | AC | 6 ms | 256 KB |