Submission #890810

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Source Code Expand

#define _CRT_SECURE_NO_WARNINGS
#pragma comment(linker, "/stack:64000000")
#include <string>
#include <vector>
#include <map>
#include <list>
#include <iterator>
#include <cassert>
#include <set>
#include <queue>
#include <iostream>
#include <sstream>
#include <stack>
#include <deque>
#include <cmath>
#include <memory.h>
#include <cstdlib>
#include <cstdio>
#include <cctype>
#include <algorithm>
#include <utility>
#include <time.h>
#include <complex>
using namespace std;

#define FOR(i, a, b) for(int i=(a);i<(b);i++)
#define RFOR(i, b, a) for(int i=(b)-1;i>=(a);--i)
#define FILL(A,value) memset(A,value,sizeof(A))

#define ALL(V) V.begin(), V.end()
#define SZ(V) (int)V.size()
#define PB push_back
#define MP make_pair
#define Pi 3.14159265358979
#define x0 ikjnrmthklmnt
#define y0 lkrjhkltr
#define y1 ewrgrg

typedef long long Int;
typedef unsigned long long UInt;
typedef vector<int> VI;
typedef pair<int, int> PII;
typedef pair<Int, Int> PLL;
typedef pair<double, double> PDD;
typedef complex<double> base;

const int INF = 1000000000;
const int BASE = 1000000007;
const int MAX = 20007;
const int MAXV = 100007;
const int MAXE = 100000;
const int ADD = 1000000;
const int MOD = 1000000007;
const int CNT = 800;


int main()
{
    //freopen("in.txt", "r", stdin);
    //freopen("distance.in",  "r", stdin);
    //freopen("distance.out", "w", stdout);
    //freopen("out.txt" , "w" , stdout);

	int n;
	cin >> n;
	VI a(n);
	FOR(i,0,n)
	{	scanf("%d" , &a[i]);
		--a[i];
	}

	int res = 0;
	FOR(i,0,n)
	{
		if (a[a[i]] == i)
		{
			++res;
		}
	}
	res /= 2;

	cout << res << endl;

    return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:68:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  { scanf("%d" , &a[i]);
                       ^

Judge Result