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Solution.cs
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37 lines (34 loc) · 697 Bytes
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public class Solution
{
public int FindKthNumber(int n, int k)
{
int curr = 1;
k--;
while (k > 0)
{
int step = CountSteps(n, curr, curr + 1);
if (step <= k)
{
curr++;
k -= step;
}
else
{
curr *= 10;
k--;
}
}
return curr;
}
private int CountSteps(int n, long d1, long d2)
{
int steps = 0;
while (d1 <= n)
{
steps += int.Min((int)(n + 1 - d1), (int)(d2 - d1));
d1 *= 10;
d2 *= 10;
}
return steps;
}
}