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Merge pull request #3121 from dmitry-ivashenko/1370-increasing-decrea…
…sing-string Create 1370-increasing-decreasing-string.cs
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public class Solution { | ||
public string SortString(string s) { | ||
var charCounts = new Dictionary<char, int>(); | ||
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foreach (var ch in s) { | ||
if (charCounts.ContainsKey(ch)) { | ||
charCounts[ch]++; | ||
} else { | ||
charCounts[ch] = 1; | ||
} | ||
} | ||
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var sortedKeys = charCounts.Keys.ToList(); | ||
sortedKeys.Sort(); | ||
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var pattern = string.Concat(sortedKeys) + string.Concat(sortedKeys.AsEnumerable().Reverse()); | ||
var maxItem = charCounts.Values.Max(); | ||
var sample = string.Concat(Enumerable.Repeat(pattern, (maxItem / 2) + 1)); | ||
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var result = ""; | ||
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foreach (var ch in sample) { | ||
if (charCounts.ContainsKey(ch) && charCounts[ch] > 0) { | ||
result += ch; | ||
charCounts[ch]--; | ||
} | ||
} | ||
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return result; | ||
} | ||
} |