Submission #1227902
Source Code Expand
#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define mp make_pair
typedef long long ll;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef complex<double> point;
#define xx real()
#define yy imag()
#define REP(i, a, b) for(int i = (a); i < (int)(b); i++)
#define REPN(i, a, b) for(int i = (a); i <= (int)(b); i++)
#define FA(it, x) for(__typeof((x).begin()) it = (x).begin(); it != (x).end(); it++)
#define SZ(x) (int)(x).size()
#define BE(x) (x).begin(), (x).end()
#define SORT(x) sort(BE(x))
#define _1 first
#define _2 second
#define x1 gray_cat_x1
#define y1 gray_cat_y1
template<class T> T gcd(T a, T b) { return b ? gcd(b, a % b) : a; }
#define file "cycle"
const double EPS = 1e-9;
const double PI = acos(-1.);
const int INF = 1e9;
const ll MOD = 1e9 + 7;
const int MAXN = 1e5 + 5;
int p[MAXN];
void solve(){
int n;
scanf("%d", &n);
REPN(i, 1, n){
scanf("%d", &p[i]);
}
int ans = 0;
REPN(i, 1, n){
if (p[p[i]] == i){
ans++;
}
}
ans /= 2;
printf("%d\n", ans);
}
int main(){
//freopen(file".in", "r", stdin); freopen(file".out", "w", stdout);
int t = 1;
//cin >> t;
while(t--){
solve();
}
}
Submission Info
Submission Time |
|
Task |
B - Friendly Rabbits |
User |
Timur_Sitdikov |
Language |
C++14 (GCC 5.4.1) |
Score |
200 |
Code Size |
1225 Byte |
Status |
AC |
Exec Time |
11 ms |
Memory |
640 KB |
Compile Error
./Main.cpp: In function ‘void solve()’:
./Main.cpp:40:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
scanf("%d", &n);
^
./Main.cpp:42:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
scanf("%d", &p[i]);
^
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 |
10 ms |
640 KB |
1_02.txt |
AC |
10 ms |
640 KB |
1_03.txt |
AC |
10 ms |
640 KB |
1_04.txt |
AC |
10 ms |
640 KB |
1_05.txt |
AC |
10 ms |
640 KB |
1_06.txt |
AC |
11 ms |
640 KB |
1_07.txt |
AC |
10 ms |
640 KB |
1_08.txt |
AC |
5 ms |
384 KB |
1_09.txt |
AC |
9 ms |
512 KB |
1_10.txt |
AC |
8 ms |
512 KB |
1_11.txt |
AC |
3 ms |
256 KB |