删除C数组中的重复项

#include <stdio.h>

int removeDuplicates(int arr[], int n) {
    int result[n];
    int resultIndex = 0;
    
    for (int i = 0; i < n; i++) {
        int isDuplicate = 0;
        for (int j = 0; j < resultIndex; j++) {
            if (arr[i] == result[j]) {
                isDuplicate = 1;
                break;
            }
        }
        if (!isDuplicate) {
            result[resultIndex] = arr[i];
            resultIndex++;
        }
    }
    
    for (int i = 0; i < resultIndex; i++) {
        arr[i] = result[i];
    }
    
    return resultIndex;
}

int main() {
    int arr[] = {1, 2, 3, 4, 3, 2, 1};
    int n = sizeof(arr) / sizeof(arr[0]);
    
    int uniqueCount = removeDuplicates(arr, n);
    
    printf("Unique elements:\n");
    for (int i = 0; i < uniqueCount; i++) {
        printf("%d ", arr[i]);
    }
    
    return 0;
}

Unique elements:
1 2 3 4