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// 565. Array Nesting
#include "leetcode.h"
/*
* you are given an integer array 'nums' of length 'n' where 'nums' is a
* permutation of the numbers in the range '[0, n - 1]'. you should bild a set
* 's[k] = {nums[k], nums[nums[k]], ... }' subjected to the following rules: the
* first element in 's[k]' starts with the selection of the element 'nums[k]' of
* 'index = k'. the next element in 's[k]' should be 'nums[nums[k]]', and so on.
* we stop adding right before a duplication element occurs in 's[k]'. return
* the longest set of 's[k]'
*/
int arrayNesting(int *nums, int numsSize) {
int max = 0, cnt = 0;
for (int i = 0; i < numsSize; i++)
if (nums[i] != -1) {
int j = nums[i];
cnt = 0;
while (j != i) {
cnt++;
int tmp = nums[j];
nums[j] = -1;
j = tmp;
}
cnt++;
if (cnt > max)
max = cnt;
}
return max;
}
int main() {
int n1[] = {5, 4, 0, 3, 1, 6, 2}, n2[] = {0, 1, 2};
printf("%d\n", arrayNesting(n1, ARRAY_SIZE(n1))); // expect: 4
printf("%d\n", arrayNesting(n2, ARRAY_SIZE(n2))); // expect: 1
}
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