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40 lines (37 loc) · 1.04 KB
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Copy pathsolution38.java
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40 lines (37 loc) · 1.04 KB
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package nowcoder;
import java.util.ArrayList;
import java.util.Arrays;
public class solution38 {
private ArrayList<String> ret = new ArrayList<>();
public ArrayList<String> Permutation(String str) {
if(str.length()==0)
{
return ret;
}
char[] chars = str.toCharArray();
Arrays.sort(chars);
backtracking(chars,new boolean[chars.length],new StringBuffer());
return ret;
}
private void backtracking(char[] chars, boolean[] hasUsed, StringBuffer s) {
if(s.length()==chars.length)
{
ret.add(s.toString());
return;
}
for(int i = 0;i<chars.length;i++)
{
if(hasUsed[i])
continue;
if(i!=0 && chars[i]==chars[i-1] && !hasUsed[i-1] )
{
continue;
}
hasUsed[i] = true;
s.append(chars[i]);
backtracking(chars,hasUsed,s);
s.deleteCharAt(s.length()-1);
hasUsed[i] = false;
}
}
}