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Copy pathsolution38_3.java
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57 lines (49 loc) · 1.38 KB
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package nowcoder;
import java.util.ArrayList;
import java.util.Arrays;
public class solution38_3 {
public ArrayList<String> Permutation2(String str){
ArrayList<String> list = new ArrayList<String>();
if(str==null || str.length()==0){
return list;
}
char[] chars = str.toCharArray();
Arrays.sort(chars);
list.add(String.valueOf(chars));
int len = chars.length;
while(true){
int lIndex = len-1;
int rIndex;
while(lIndex>=1 && chars[lIndex-1]>=chars[lIndex]){
lIndex--;
}
if(lIndex == 0)
break;
rIndex = lIndex;
while(rIndex<len && chars[rIndex]>chars[lIndex-1]){
rIndex++;
}
swap(chars,lIndex-1,rIndex-1);
reverse(chars,lIndex);
list.add(String.valueOf(chars));
}
return list;
}
private void reverse(char[] chars,int k){
if(chars==null || chars.length<=k)
return;
int len = chars.length;
for(int i=0;i<(len-k)/2;i++){
int m = k+i;
int n = len-1-i;
if(m<=n){
swap(chars,m,n);
}
}
}
private void swap(char[] cs,int i,int j){
char temp = cs[i];
cs[i] = cs[j];
cs[j] = temp;
}
}