Submission #892748

---

Source Code Expand

#include <iostream>
#include <bitset>
#include <assert.h>
#include <stdlib.h>
#include <time.h>
#include <stdio.h>
#include <vector>
#include <set>
#include <map>
#include <queue>
#include <stack>
#include <string>
#include <string.h>
#include <cmath>
#include <memory.h>
#include <algorithm>
using namespace std;
typedef long long ll;
int f[100000];
int main()
{
	int n;
	scanf("%d",&n);
	for(int i=0;i<n;++i){
		scanf("%d",&f[i]);
		--f[i];
	}
	int res=0;
	for(int i=0;i<n;++i){
		int x=f[i];
		if(x<i)
			continue;
		if(f[x]==i)
			++res;
	}
	cout<<res<<endl;
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:23:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
                ^
./Main.cpp:25:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&f[i]);
                    ^

Judge Result