Help me in solving CFRTEST problem

help
,
1

My issue

“When run on each test case individually, your code appears to be correct. However, when run on the entire test file, it returns a WA. The most common reasons for this are that you do not have a newline after each test case, or you do not reinitialize some variables in each test case.” i got this error idk why

My code

#include <stdio.h>

int nb_repetitons(int x, int y[50], int num)
{
    int repetitions = 0;
    for (int i = 0; i < x; i++){
        if (y[i] == num){
            repetitions++;
        }
    }
    if (repetitions > 1){
        return 0;
    }
    return 1;
}

void solve(){
    int n, y[50], ret;
    
    ret = 0;
    scanf("%d", &n);
    for (int i = 0; i <= n; i++){
        scanf("%d", &y[i]);
    }
    for (int i = 0; i <= n; i++){
        if (nb_repetitons(n, y, y[i]) == 1){
            ret++;
        }
    }
    if (ret == 0){
        ret = ret + 1;
    }
    if (ret != 1){
        ret = ret - 1;
    }
    printf("%d\n", ret);
}

int main(void) {
	int t;
	scanf("%d", &t);
	while(t--){
	    solve();
	}
	return 0;
}

Learning course: Arrays, Strings & Sorting
Problem Link: Devu and friendship testing Practice Problem in - CodeChef

2

@inputname
the logic is u have to count the distinct numbers overall the array.
refer my c++ code for better understanding

#include <bits/stdc++.h>
using namespace std;

int main() {
	// your code goes here
	int t;
	cin>>t;
	while(t--)
	{
	    int n;
	    cin>>n;
	    int a[n];
	    set<int> s;
	    for(int i=0;i<n;i++)
	    {
	        cin>>a[i];
	        s.insert(a[i]);
	    }
	    cout<<s.size()<<endl;
	}
	return 0;
}