Submission #891675

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Source Code Expand

#include <cstdlib>
#include <cstdio>
#include <iostream>
#include <cmath>
#include <algorithm>
#include <vector>
#include <set>
#include <map>
#include <cstring>

using namespace std;

typedef long long LL;
typedef unsigned long long ULL;

#define SIZE(x) (int((x).size()))
#define rep(i,l,r) for (int i=(l); i<=(r); i++)
#define repd(i,r,l) for (int i=(r); i>=(l); i--)
#define rept(i,c) for (typeof((c).begin()) i=(c).begin(); i!=(c).end(); i++)

#ifndef ONLINE_JUDGE
#define debug(x) { cerr<<#x<<" = "<<(x)<<endl; }
#else
#define debug(x) {}
#endif

int a[100010];

void lemon()
{
	int n;
	scanf("%d",&n);
	rep(i,1,n) scanf("%d",&a[i]);
	int cnt=0;
	rep(i,1,n) if (a[a[i]]==i && a[a[a[i]]]==a[i]) cnt++;
	printf("%d\n",cnt/2);
}

int main()
{
	ios::sync_with_stdio(true);
	#ifndef ONLINE_JUDGE
		//freopen("b.in","r",stdin);
	#endif
	lemon();
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘void lemon()’:
./Main.cpp:32:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
                ^
./Main.cpp:33:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  rep(i,1,n) scanf("%d",&a[i]);
                              ^

Judge Result