[数据结构与算法]leetcode27移除元素.leetcode189轮转数组《C进阶百练N12》

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leetcode 27

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int removeElement(int* nums, int numsSize, int val){
    int pre=0;
    int cur=0;
    while(cur<numsSize)
    {
        if(nums[cur]!=val)
        {
            nums[pre]=nums[cur];
            cur++;
            pre++;
        }
        else
        {
            cur++;
        }
    }
    return pre;
}

leetcode 189

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void reverse(int* arr,int begin,int end)
{
    while(begin<=end)
    {
        int tmp=arr[begin];
        arr[begin]=arr[end];
        arr[end]=tmp;
        begin++;
        end--;
    }
}
void rotate(int* nums, int numsSize, int k){
    k %= numsSize;
    reverse(nums,0,numsSize-k-1);
    reverse(nums,numsSize-k,numsSize-1);
    reverse(nums,0,numsSize-1);
    return nums;
}

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