[LeetCode] Move Zeroes - 整数数组处理问题

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目录:
1.Move Zeroes  - 数组0移到末尾 [顺序交换]
2.


一.Move Zeroes 


题目概述:
Given an arraynums, 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, givennums = [0, 1, 0, 3, 12], after calling your function,nums should be[1, 3, 12, 0, 0].
Note:
        1.You must do this in-place without making a copy of the array.
        2.Minimize the total number of operations.


解题方法:

题意是把数组nums中0的元素后置,同时不能采用赋值数组。两种方法:
        1.遇到是0的元素从数组最后向前存储并移位,遇到非0元素从前存储;
        2.推荐:从前往后查找,不是0的元素前移,并计算0的个数,后面的全置0。

我的代码:
方法一:Runtime: 28 ms

void moveZeroes(int* nums, int numsSize) {    int endNum;        //从后计数0    int startNum;      //从前计数非0    int temp;    int i,j;        i = 0;    startNum = 0;    endNum = 0;    while( (i+endNum) < numsSize ) {        if(nums[i]==0) {            //依次前移            for(j=startNum; j<numsSize-endNum-1; j++) { //j少一个数                nums[j] = nums[j+1];            }            nums[numsSize-endNum-1] = 0;            endNum++;        }        else {            nums[startNum] = nums[i];            startNum++;            i++;        }    }}
方法二:Runtime: 8 ms
void moveZeroes(int* nums, int numsSize) {    int count;   //计算0的个数    int i,j;    int n;        n = 0;    count = 0;    for(i=0; i<numsSize; i++) {        if(nums[i]==0) {            count++;        }        else  {            nums[n] = nums[i];            n++;        }    }    //后置0    for(j=0; j<count; j++) {        nums[n] = 0;        n++;    }}



(By:Eastmount 2015-9-20 晚上8半   http://blog.csdn.net/eastmount/)

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