[LeetCode][440. K-th Smallest in Lexicographical Order]

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By Long Luo

This article is the solution of Problem 440. K-th Smallest in Lexicographical Order.

Brute Force

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public int findKthNumber(int n, int k) {
    String[] numStrs = new String[n];
    for (int i = 1; i <= n; i++) {
        numStrs[i - 1] = "" + i;
    }

    Arrays.sort(numStrs);

    return Integer.parseInt(numStrs[k - 1]);
}

Analysis

  • Time Complexity: O(nlogn)O(nlogn).
  • Space Complexity: O(n)O(n).

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