LeetCode-Solutions/C++/array-nesting.cpp at master · pythonpeixun/LeetCode-Solutions · GitHub

22 lines (21 loc) · 617 Bytes

// Time: O(n)

// Space: O(1)

class Solution {

public:

int arrayNesting(vector<int>& nums) {

auto result = 0;

for (const auto& num : nums) {

if (num != numeric_limits<int>::max()) {

auto start = num, count = 0;

while (nums[start] != numeric_limits<int>::max()) {

auto temp = start;

start = nums[start];

nums[temp] = numeric_limits<int>::max();

++count;

}

result = max(result, count);

}

return result;

}

};

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