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Solution.cs
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60 lines (54 loc) · 1.31 KB
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public class Solution
{
public string FindLexSmallestString(string s, int a, int b)
{
string ans = s;
HashSet<string> visited = [];
Queue<string> queue = [];
queue.Enqueue(s);
visited.Add(s);
while (queue.Count > 0)
{
string curr = queue.Dequeue();
if (string.Compare(curr, ans) < 0)
{
ans = curr;
}
string rotate = Rotate(curr, b);
string update = Update(curr, a);
if (visited.Add(rotate))
{
queue.Enqueue(rotate);
}
if (visited.Add(update))
{
queue.Enqueue(update);
}
}
return ans;
}
string Rotate(string s, int k)
{
int n = s.Length;
StringBuilder sb = new();
for (int i = k; i < n; i++)
{
sb.Append(s[i]);
}
for (int i = 0; i < k; i++)
{
sb.Append(s[i]);
}
return sb.ToString();
}
string Update(string s, int k)
{
int n = s.Length;
StringBuilder sb = new(s);
for (int i = 1; i < n; i += 2)
{
sb[i] = (char)(((sb[i] - '0' + k) % 10 + 10) % 10 + '0');
}
return sb.ToString();
}
}