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reducing space in the radixSort #50

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12 changes: 10 additions & 2 deletions 12 src/java/main/RadixSort.java
Original file line number Diff line number Diff line change
Expand Up @@ -51,10 +51,18 @@ private int[] radixSort(int[] arr, int maxDigit) {

for (int i = 0; i < maxDigit; i++, dev *= 10, mod *= 10) {
// 考虑负数的情况,这里扩展一倍队列数,其中 [0-9]对应负数,[10-19]对应正数 (bucket + 10)
int[][] counter = new int[mod * 2][0];
// int[][] counter = new int[mod * 2][0];

//这里不需要每次都new一个mod * 2行大小的二维数组,只需要初始化10(或20行即可),因为我们每次只提取数字的一位(0~9)
int[][] counter = new int[10][0];

for (int j = 0; j < arr.length; j++) {
int bucket = ((arr[j] % mod) / dev) + mod;

// int bucket = ((arr[j] % mod) / dev) + mod;

// 这里也不需要再加一个 mod ,因为我们只需要将其分到0~9桶中的一个即可.
int bucket = ((arr[j] % mod) / dev);

counter[bucket] = arrayAppend(counter[bucket], arr[j]);
}

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