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/**

* https://leetcode.com/articles/move-zeroes/

*/

public class MoveZeroes {

/**

* 要保持顺序

*/

public void moveZeroes(int[] nums) {

int j = 0;

for (int i = 0; i < nums.length; i++) {

if (nums[i] != 0) {

nums[j++] = nums[i];

}

}

for ( ; j < nums.length; nums[j++] = 0);

}

private void swap(int[] nums, int i, int j) {

int t = nums[i];

nums[i] = nums[j];

nums[j] = t;

}

/**

* 如果不要求保持顺序，且写的次数最少

* 从两头开始往中间走，如果左边是0，右边非0，则交换，写的次数是0的个数乘2

*/

public void moveZeroes2(int[] nums) {

for (int i = 0, j = nums.length - 1; j > i; ) {

if (nums[i] != 0) {

i++;

} else if (nums[j] != 0) {

swap(nums, i, j--);

} else {

j--;

}

}

}

}