Very simple C++ solution O(n) time O(1) space

  • 0

    The idea here is try to reset the cycle for each i so that nums[i] = i.
    For example, A = [5,4,0,3,1,6,2]
    The cycle for i=0 is 0->5->6->2->0, after reset the cycle, the array become,

    The code is simple, but the original input array will be changed.

    int arrayNesting(vector<int>& nums) {
            int ans = 1, count=0;
            for(int i = 0; i < nums.size(); count = 0,i++){
                while (i != nums[i]){
                    swap(i, nums[i]); 
                ans = max(ans, count);
            return ans;

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