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| #include<stdio.h>
#include<stdlib.h>
#include<stdbool.h>
bool loopCheck(int* arr, int n, int p);
int result(int* arr, int count);
int main()
{
int n, time = 0;
scanf("%d", &n);
int* arr = (int*)malloc(sizeof(int) * n);
int arr2[1000] = {0};
for (int i = 0; i < n; i++)
{
scanf("%d", &arr[i]);
}
for (int i = 0; i < n; i++)
{
if (!loopCheck(arr,n,i))
{
arr2[time++] = i + 1;
}
}
printf("%d", result(arr2,time));
free(arr);
return 0;
}
bool loopCheck(int* arr,int n, int p)
{
int time = 0;
while (time<n)
{
if (arr[arr[p] - 1] == p + 1)
{
return true;
}
else if (arr[p] == 0)
{
return false;
}
else if (arr[p] - 1 == p)
{
return false;
}
p=arr[p]-1;
}
return true;
}
int result(int* arr, int count) {
int xorResult = 0;
for (int i = 0; i < count; i++) {
xorResult ^= arr[i];
}
return xorResult;
}
|
