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34 lines (34 loc) · 794 Bytes
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Solution.cs
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34 lines (34 loc) · 794 Bytes
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public class Solution
{
public string RobotWithString(string s)
{
int[] count = new int[26];
foreach (char c in s)
{
count[c - 'a']++;
}
Stack<char> st = new();
StringBuilder sb = new();
int minCh = 'a';
int i = 0, n = s.Length;
while (i < n)
{
while (minCh <= 'z' && count[minCh - 'a'] <= 0) minCh++;
if (st.Count > 0 && st.Peek() <= minCh)
{
sb.Append(st.Pop());
}
else
{
st.Push(s[i]);
count[s[i] - 'a']--;
i++;
}
}
while (st.Count > 0)
{
sb.Append(st.Pop());
}
return sb.ToString();
}
}