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.
Credits:
Special thanks to @jianchao.li.fighter for adding this problem and creating all test cases.
思路： 使用一个索引，指向将要替换数字的位置， 若值非空，则将该值赋值到索引所在的位置，并将索引往后移位。
class Solution { public: void moveZeroes(vector<int>& nums) { int j=0; for(int val:nums) { if(val!=0) nums[j++]=val; } for(;i<nums.size();j++) nums[j]=0; } };