Question

How to find the first repeating element in a given array with C++

Answer 1

#include <iostream>

int get_first_repeating_element(int arr[], int size) {
    for (int i = 0; i < size; i++) {
        for (int j = i + 1; j < size; j++) {
            if (arr[i] == arr[j]) {
                return arr[i];
            }
        }
    }
    
    return -1;
}
    
int main()
{
    int arr[] = {1, 3, 5, 6, 9, 5, 10, 12, 6, 13, 12};
    int size = sizeof(arr)/sizeof(arr[0]); 
     
    std::cout << get_first_repeating_element(arr, size);
}

    
    
    
/*
run:
    
5
   
*/

 

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