Submission #891097
Source Code Expand
#include<iostream> #include<iomanip> #include<algorithm> #include<array> #include<bitset> #include<cassert> #include<cctype> #include<cmath> #include<cstdio> #include<cstring> #include<functional> #include<limits> #include<list> #include<map> #include<numeric> #include<set> #include<stack> #include<string> #include<sstream> #include<unordered_map> #include<queue> #include<vector> using namespace std; using ll = long long; using ull = unsigned long long; using pii = pair<int, int>; #define rep(i,a,b) for(int i=(a);i<(b);i++) #define rrep(i,a,b) for(int i=(b)-1;i>=(a);i--) #define all(a) (a).begin(),(a).end() #define dump(o) {cerr<<#o<<" "<<o<<endl;} #define dumpc(o) {cerr<<#o; for(auto &e:(o))cerr<<" "<<e;cerr<<endl;} #define INF 0x3f3f3f3f #define INFL 0x3f3f3f3f3f3f3f3fLL const int MOD = 1e9 + 7; signed main() { int N; cin >> N; vector<int> a(N); rep(i, 0, N) { cin >> a[i]; a[i]--; } int cnt = 0; rep(i, 0, N) { if (i == a[a[i]])cnt++; } cout << cnt / 2 << endl; return 0; }
Submission Info
Submission Time | |
---|---|
Task | B - Friendly Rabbits |
User | minaminao |
Language | C++14 (GCC 5.4.1) |
Score | 200 |
Code Size | 1048 Byte |
Status | AC |
Exec Time | 31 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 | 2 ms | 256 KB |
0_01.txt | AC | 2 ms | 256 KB |
0_02.txt | AC | 2 ms | 256 KB |
1_00.txt | AC | 3 ms | 256 KB |
1_01.txt | AC | 30 ms | 640 KB |
1_02.txt | AC | 30 ms | 640 KB |
1_03.txt | AC | 30 ms | 640 KB |
1_04.txt | AC | 30 ms | 640 KB |
1_05.txt | AC | 31 ms | 640 KB |
1_06.txt | AC | 30 ms | 640 KB |
1_07.txt | AC | 30 ms | 640 KB |
1_08.txt | AC | 13 ms | 384 KB |
1_09.txt | AC | 25 ms | 512 KB |
1_10.txt | AC | 22 ms | 512 KB |
1_11.txt | AC | 7 ms | 256 KB |