400. Nth Digit

Find the nth digit of the infinite integer sequence 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, …

Note:
n is positive and will fit within the range of a 32-bit signed integer (n < 231).

Example 1:

Input:
3

Output:
3
Example 2:

Input:
11

Output:
0

Explanation:
The 11th digit of the sequence 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, … is a 0, which is part of the number 10.

public class Solution {    public int findNthDigit(int n) {        int len = 1;        int start = 1;        long cnt = 9;        while (n > len * cnt) {            n -= len * cnt;            len++;            cnt *= 10;            start *= 10;        }        start += (n-1) / len;        String s = Integer.toString(start);        return Character.getNumericValue(s.charAt((n-1) % len));    }}