Submission #1697371


Source Code Expand

#include <cstdio>

#define MAX_N 100001

int N, counts, a[MAX_N];
bool checked[MAX_N];

int main()
{
  scanf("%d", &N);
  for (int i = 1; i <= N; i++)
    scanf("%d", &a[i]);

  for (int i = 1; i <= N; i++)
  {
    if (!checked[i] && i == a[a[i]])
    {
      checked[i] = true;
      checked[a[i]] = true;
      counts++;
    }
  }
  printf("%d\n", counts);
  return 0;
}

Submission Info

Submission Time
Task B - Friendly Rabbits
User nersery
Language C++14 (GCC 5.4.1)
Score 200
Code Size 396 Byte
Status AC
Exec Time 10 ms
Memory 640 KB

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:10:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &N);
                  ^
./Main.cpp:12:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &a[i]);
                       ^

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 200 / 200
Status
AC × 3
AC × 15
Set Name Test Cases
Sample 0_00.txt, 0_01.txt, 0_02.txt
All 0_00.txt, 0_01.txt, 0_02.txt, 1_00.txt, 1_01.txt, 1_02.txt, 1_03.txt, 1_04.txt, 1_05.txt, 1_06.txt, 1_07.txt, 1_08.txt, 1_09.txt, 1_10.txt, 1_11.txt
Case Name Status Exec Time Memory
0_00.txt AC 1 ms 128 KB
0_01.txt AC 1 ms 128 KB
0_02.txt AC 1 ms 128 KB
1_00.txt AC 1 ms 128 KB
1_01.txt AC 10 ms 640 KB
1_02.txt AC 10 ms 512 KB
1_03.txt AC 10 ms 640 KB
1_04.txt AC 10 ms 640 KB
1_05.txt AC 10 ms 640 KB
1_06.txt AC 10 ms 640 KB
1_07.txt AC 10 ms 512 KB
1_08.txt AC 4 ms 256 KB
1_09.txt AC 8 ms 512 KB
1_10.txt AC 7 ms 384 KB
1_11.txt AC 2 ms 256 KB