Question

How to find all duplicate elements in int array using C

Answer 1

#include <stdio.h>
  
int main(int argc, char **argv) 
{
   	int arr[] = { 1, 1, 2, 3, 4, 4, 4, 5, 6, 6, 7, 7, 7, 7 };
    int duplicate[10] = {0};
    int len = sizeof(arr) / sizeof(arr[0]);
     
    for (int i = 0; i < len; i++) {
        for (int j = i + 1; j < len; j++) {
            if (arr[i] == arr[j]) {
                duplicate[arr[i]] = 1;
                break;
            }
        }
    }
     
    for (int i = 0; i < 10; i++) {
        if (duplicate[i])
            printf("%d\n", i);
    }
 
    return 0; 
}
   
     
/*
run:
   
1
4
6
7

*/

 

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