Submission #891393

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Source Code Expand

#pragma comment(linker, "/STACK:500000000")
#define _CRT_SECURE_NO_WARNINGS
#include <algorithm>
#include <assert.h>
#include <bitset>
#include <functional>
#include <iostream>
#include <list>
#include <map>
#include <math.h>
#include <set>
#include <stack>
#include <stdio.h>
#include <stdlib.h>
#include <string>
#include <string.h>
#include <time.h>
#include <queue>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>
using namespace std;

#define y0 y0ChloeGraceMoretz
#define y1 y1ChloeGraceMoretz
typedef long long ll;
typedef unsigned long long ull;
int nextInt() { int n; scanf("%d", &n); return n; }
ll nextLong() { ll n; scanf("%lld", &n); return n; }
const double PI = acos(-1.0);
const double EPS = 1e-9;
const int INF = (int)2e9;
const int MOD = (int)1e9 + 7;

int a[(int)1e5 + 9];

int main() {
	//freopen("in.txt", "rt", stdin);
	//freopen("out.txt", "wt", stdout);
	int n;
	scanf("%d", &n);
	for (int i = 1; i <= n; ++i) {
		scanf("%d", &a[i]);
	}
	int res = 0;
	for (int i = 1; i <= n; ++i) {
		if (i < a[i] && a[a[i]] == i) {
			++res;
		}
	}
	printf("%d\n", res);
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int nextInt()’:
./Main.cpp:29:39: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
 int nextInt() { int n; scanf("%d", &n); return n; }
                                       ^
./Main.cpp: In function ‘ll nextLong()’:
./Main.cpp:30:40: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
 ll nextLong() { ll n; scanf("%lld", &n); return n; }
                                        ^
./Main.cpp: In function ‘int main()’:
./Main.cpp:42:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
                 ^
./Main.cpp:44:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &a[i]);
                     ^

Judge Result