【编程题】寻找重复次数最多的数

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【编程题】寻找重复次数最多的数

题目描述：

Find the maximum repeating number in O(n) time and O(1) extra space

我的代码：

// C++ program to find the maximum repeating number

#include<iostream>
using namespace std;

// Returns maximum repeating element in arr[0..n-1].
// The array elements are in range from 0 to k-1
int maxRepeating(int* arr, int n, int k)
{
    // Iterate though input array, for every element
    // arr[i], increment arr[arr[i]%k] by k
    for (int i = 0; i< n; i++)
        arr[arr[i]%k] += k;

    // Find index of the maximum repeating element
    int max = arr[0], result = 0;
    for (int i = 1; i < n; i++)
    {
        if (arr[i] > max)
        {
            max = arr[i];
            result = i;
        }
    }

    /* Uncomment this code to get the original array back
       for (int i = 0; i< n; i++)
          arr[i] = arr[i]%k; */

    // Return index of the maximum element
    return result;
}

// Driver program to test above function
int main()
{
    int arr[] = {2, 3, 3, 5, 3, 4, 1, 7};
    int n = sizeof(arr)/sizeof(arr[0]);
    int k = 8;

    cout << "The maximum repeating number is " <<
         maxRepeating(arr, n, k) << endl;

    return 0;
}

参考资料

https://www.geeksforgeeks.org/find-the-maximum-repeating-number-in-ok-time/