Find Duplicate in Range 0 and n-1

Code

#include <stdio.h>

int find_duplicate(int arr[], int n) {
    int count = 0;
    int v;
    for(int i=0;i<n-1;i++){
        int count1 = 1;
        for(int j = i+1;j<n;j++){
            if(arr[i]==arr[j]){
                count1++;
            }
        }

        if(count1>count){
            count = count1;
            v = arr[i];
        }

    }
    return v;
}

int main() {
    int n;
    scanf("%d", &n);

    int arr[100];
    for (int i = 0; i < n; i++) scanf("%d", &arr[i]);

    int result = find_duplicate(arr, n);
    printf("%d", result);
    return 0;
}

Solving Approach