Leetcode 400 Solution

This article provides solution to leetcode question 400 (nth-digit)
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https://leetcode.com/problems/nth-digit

Solution

class Solution {
public:
    int findNthDigit(int n) {
        n--;
        int64_t base = 1;
        int64_t curr_cnt = 9;
        int digit = 1;

        while (n > curr_cnt * digit)
        {
            n -= curr_cnt * digit;
            base *= 10;
            curr_cnt *= 10;
            digit++;
        }

        int target_num = base + n / digit;
        string target_num_str = to_string(target_num);
        return target_num_str[n % digit] - '0';
    }
};