Submission #891306

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Source Code Expand

#include<cstdio>
#include<algorithm>
#include<cstring>
#include<string>
#include<iostream>
#include<stack>
using namespace std;
typedef long long ll;
const int maxn=200005;

int a[maxn];
int n;

int main() {
    //freopen("in.cpp","r",stdin);
    scanf("%d",&n);
    for(int i=1;i<=n;i++)scanf("%d",&a[i]);
    int ret=0;
    for(int i=1;i<=n;i++)if(a[a[i]]==i)ret++;
    printf("%d\n",ret/2);
    return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:16:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&n);
                   ^
./Main.cpp:17:43: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     for(int i=1;i<=n;i++)scanf("%d",&a[i]);
                                           ^

Judge Result