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Copy pathQuick.java
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Copy pathQuick.java
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60 lines (52 loc) · 1.44 KB
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public class Quick {
public static void sort(int[] a){
sort(a, 0, a.length - 1);
}
private static void sort(int[] a, int lo, int hi){
if(hi <= lo)
return ;
int j = partition(a, lo, hi);
sort(a, lo, j - 1);
sort(a, j + 1, hi);
}
public static void sort3(int[] a){
sort3(a, 0, a.length - 1);
}
private static void sort3(int[] a, int lo, int hi){
if(hi <= lo)
return;
int lt = lo, gt = hi, i = lo + 1;
int v = a[lo];
while(i <= gt){
if(a[i] < v) Selection.exch(a, lt++, i++);
else if(a[i] > v) Selection.exch(a, i, gt--);
else i++;
}
sort3(a, lo, lt - 1);
sort3(a, gt + 1, hi);
}
private static int partition(int[] a, int lo, int hi){
int v = a[lo];
int i = lo, j = hi + 1;
while(true){
while(a[++i] < v) if(i == hi) break;
while(a[--j] > v) if(j == lo) break;
if(j <= i)
break;
Selection.exch(a, i, j);
}
Selection.exch(a, lo, j);
return j;
}
public static void main(String[] args){
int[] a = Visualize.randArray(47);
/********************
Visualize.show(a);
sort(a);
Visualize.show(a);
********************/
Visualize.show(a);
sort3(a);
Visualize.show(a);
}
}