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 |
|
|
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 |