给你一个数组array和一个值(target),需要原地移除所有数值等于target的元素,并返回移除后数组的新长度
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public class LC27_remove_element { public static void main(String[] args) { int[] array = {5, 9, 5, 36, 84, 96, 125, 456, 535}; System.out.println(remove_element(array,5)); System.out.println(remove_element_doblePointer(array,5)); } private static int remove_element(int[] array, int target) { int count = 0; for (int i = 0; i < array.length; i++) { if (array[i] == target) { count += 1; for (int j = i+1; j < array.length; j++) { array[j-1] = array[j]; } i--; } } return array.length-count; } private static int remove_element_doblePointer(int[] array, int target) { //慢指针slowIndex int slowIndex = 0; for (int fastIndex = 0; fastIndex < array.length; fastIndex++) { if (array[fastIndex] != target) { array[slowIndex++] = array[fastIndex]; } } return slowIndex; } }
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