Submission #891124


Source Code Expand

#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <climits>
#include <vector>
#include <string>
#include <queue>
#include <deque>
#include <list>
#include <stack>
#include <set>
#include <map>
#include <algorithm>

#define int long long
#define MOD7 1000000007
#define MOD9 1000000009

#define rep(i, n) for (int i = 0; i < (n); i++)
#define all(a) (a).begin(), (a).end()

using namespace std;

int dx[4] = { 1, 0, -1, 0 };
int dy[4] = { 0, -1, 0, 1 };

int nextInt() {int a; cin >> a; return a;}
char nextChar() {char a; cin >> a; return a;}
double nextDouble() {double a; cin >> a; return a;}
string nextString() {string a; cin >> a; return a;}

void inputVector(vector<int> &v, int &n) {rep(i,n){v.push_back(nextInt());}}
void inputVector(vector<double> &v, int &n) {rep(i,n){v.push_back(nextDouble());}}
void inputVector(vector<string> &v, int &n) {rep(i,n){v.push_back(nextString());}}

signed main() {
	int N;
	cin >> N;

	vector<int> a;
	inputVector(a, N);

	rep(i, N) a[i]--;

	int ret = 0;
	rep(i, N) {
		if (a[a[i]] == i) ret++;
	}

	cout << ret / 2 << endl;

    return 0;
}

Submission Info

Submission Time
Task B - Friendly Rabbits
User iwashi31
Language C++14 (GCC 5.4.1)
Score 200
Code Size 1193 Byte
Status AC
Exec Time 33 ms
Memory 1400 KB

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 200 / 200
Status
AC × 3
AC × 15
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 32 ms 1400 KB
1_02.txt AC 32 ms 1400 KB
1_03.txt AC 32 ms 1400 KB
1_04.txt AC 32 ms 1400 KB
1_05.txt AC 33 ms 1400 KB
1_06.txt AC 33 ms 1400 KB
1_07.txt AC 32 ms 1400 KB
1_08.txt AC 14 ms 892 KB
1_09.txt AC 27 ms 1400 KB
1_10.txt AC 24 ms 1400 KB
1_11.txt AC 8 ms 640 KB