LeetCode Sliding Window Maximum

Description

Given an array nums, there is a sliding window of size k which is moving from the very left of the array to the very right. You can only see the k numbers in the window. Each time the sliding window moves right by one position.

For example,
Given nums = [1,3,-1,-3,5,3,6,7], and k = 3.

Window position                Max
---------------               -----
[1  3  -1] -3  5  3  6  7       3
 1 [3  -1  -3] 5  3  6  7       3
 1  3 [-1  -3  5] 3  6  7       5
 1  3  -1 [-3  5  3] 6  7       5
 1  3  -1  -3 [5  3  6] 7       6
 1  3  -1  -3  5 [3  6  7]      7

Therefore, return the max sliding window as [3,3,5,5,6,7].

The original problem is here.

The original code is here.

My Solution

I solve this problem in C++, as below:

/*
*Sliding Window Maximum 
*Author: shuaijiang
*Email: zhaoshuaijiang8@gmail.com
*/
#include<iostream>
#include<vector>
#include<algorithm>
#include<stdlib.h>
using namespace std;

class Solution {
public:
    vector<int> maxSlidingWindow(vector<int>& nums, int k) {
        int size = nums.size();
        vector<int> result;
        int maxNum;
        
        if(size<=0)
            return result;
        if(k==1)
            return nums;
        
        maxNum = maxArray(nums, 0, k-1);
        result.push_back(maxNum);
        
        for(int i=k;i<size;i++){
            maxNum = maxArray(nums, i-k+1, i);
            result.push_back(maxNum);
        }
        return result;
    }
    int maxArray(vector<int>& nums, int start, int end){
        int maxNum = nums[start];
        for(int i = start+1;i<=end;i++){
            if(nums[i] > maxNum)
                maxNum = nums[i];
        }
        return maxNum;
    }
};

Note

To solve the problem, when sliding the window, get the maximum number.