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quick3string.java
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46 lines (42 loc) · 753 Bytes
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/**
三向字符串快速排序
*/
public class Quick3String{
private static int charAt(String s, int d){
if (d < s.length()){
return s.charAt(d);
}
else{
return -1;
}
}
public static void sort(String[] a){
sort(a, 0, a.length-1, 0);
}
private static void sort(String[] a, int lo, int hi, int d){
if (hi <= lo){
return ;
}
int lt = lo;
int gt = hi;
int v = charAt(a[lo], d);
int i = lo + 1;
while (i <= gt){
int t = charAt(a[i], d);
if (t < v){
exch(a, lt++, i++); // lt是交换的基准点
}
else if (t > v){
exch(a, i, gt--); // gt是交换的基准点
}
else{
i++;
}
}
sort(a, lo, lt-1, d);
if (v >= 0){
sort(a, lt, gt, d+1);
}
sort(a, gt+1, hi, d);
}
}