update quick sort

2019-01-10 00:43:52 +08:00 · 2019-01-10 00:43:52 +08:00 · fc8635016c
commit fc8635016c
parent b9749985c0
1 changed files with 7 additions and 4 deletions
--- a/java/12_sorts/QuickSort.java
+++ b/java/12_sorts/QuickSort.java
@ -24,10 +24,13 @@ public class QuickSort {
    int i = p;
    for(int j = p; j < r; ++j) {
      if (a[j] < pivot) {
-        int tmp = a[i];
-        a[i] = a[j];
-        a[j] = tmp;
-        ++i;
+        if (i == j) {
+          ++i;
+        } else {
+          int tmp = a[i];
+          a[i++] = a[j];
+          a[j] = tmp;
+        }
      }
    }