Submission #890813


Source Code Expand

#include <bits/stdc++.h>
using namespace std;
#define REP(i,a,b) for (int i = (a); i <= (b); ++i)
#define REPD(i,a,b) for (int i = (a); i >= (b); --i)
#define FORI(i,n) REP(i,1,n)
#define FOR(i,n) REP(i,0,int(n)-1)
#define mp make_pair
#define pb push_back
#define pii pair<int,int>
#define vi vector<int>
#define ll long long
#define SZ(x) int((x).size())
#define DBG(v) cerr << #v << " = " << (v) << endl;
#define FOREACH(i,t) for (typeof(t.begin()) i=t.begin(); i!=t.end(); i++)
#define fi first
#define se second

int a[100100];

int main() {
	int n,res=0;
	scanf("%d", &n);
	FOR(i,n) scanf("%d", &a[i]);
	FOR(i,n) a[i]--;
	FOR(i,n) if (a[a[i]]==i) res++;
	printf("%d\n", res/2);
	return 0;
}

Submission Info

Submission Time
Task B - Friendly Rabbits
User ania
Language C++14 (GCC 5.4.1)
Score 200
Code Size 725 Byte
Status AC
Exec Time 12 ms
Memory 640 KB

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:22:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
                 ^
./Main.cpp:23:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  FOR(i,n) scanf("%d", &a[i]);
                             ^

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 2 ms 256 KB
0_01.txt AC 3 ms 256 KB
0_02.txt AC 2 ms 256 KB
1_00.txt AC 2 ms 256 KB
1_01.txt AC 12 ms 640 KB
1_02.txt AC 12 ms 640 KB
1_03.txt AC 12 ms 640 KB
1_04.txt AC 12 ms 640 KB
1_05.txt AC 12 ms 640 KB
1_06.txt AC 12 ms 640 KB
1_07.txt AC 12 ms 640 KB
1_08.txt AC 6 ms 384 KB
1_09.txt AC 11 ms 512 KB
1_10.txt AC 9 ms 512 KB
1_11.txt AC 4 ms 256 KB