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Copy pathsolution451.java
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38 lines (36 loc) · 1.09 KB
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import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
public class solution451 {
public String frequencySort(String s) {
Map<Character,Integer> frequencyForChar = new HashMap<>();
char[] chars = s.toCharArray();
for(char c : chars)
{
frequencyForChar.put(c,frequencyForChar.getOrDefault(c,0)+1);
}
ArrayList<Character>[] buckets = new ArrayList[chars.length+1];
for(char key:frequencyForChar.keySet())
{
int frequency = frequencyForChar.get(key);
if(buckets[frequency] == null)
{
buckets[frequency] = new ArrayList();
}
buckets[frequency].add(key);
}
StringBuilder str = new StringBuilder();
for(int i = buckets.length-1;i>=0;i++){
if(buckets[i] == null)
{
continue;
}
for(char c :buckets[i])
{
for(int j = 0;j<i;j++)
str.append(c);
}
}
return str.toString();
}
}