283 move zeroes

Given an array nums, write a function to move all 0's to the end of it while maintaining the relative order of the non-zero elements.

For example, given nums = [0, 1, 0, 3, 12], after calling your function, nums should be [1, 3, 12, 0, 0].

Note: You must do this in-place without making a copy of the array. Minimize the total number of operations.

1

两个指针，先把非零元素移动到数组前面，后面补零。

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public void moveZeroes(int[] nums) {
       if(nums == null || nums.length == 0) return;
        int n = nums.length;
        int idx = 0;
        for(int i = 0; i < n;i++){
            if(nums[i] != 0) nums[idx++] = nums[i];
        }
        for(int i = idx; i < n; i++){
            nums[i] = 0;
        }
    }

2 most votes

基本也是这种方法。