PLEASE HELP BEGINNER !! ARRAY SIMPLE 2 MINUTES WORK

Problem Code Racing horses Easy Level
IM JUST STARTING OUT :smiley:

Guys a simple question where an array is given, and we have to find the minimum difference between any two elements in the array. eg
4 9 1 32 13 answer is 3

Input:
First line of the input file contains a single integer T, the number of test cases.
Every test case starts with a line containing the integer N.
The next line contains N space separated integers where the i-th integer is S[i].

Output:
For each test case, output a single line containing the minimum difference that is possible.

Constraints:
1 ≤ T ≤ 10
2 ≤ N ≤ 5000
1 ≤ S[i] ≤ 1000000000

I need Help . I get a wrong answer(RED CROSS) every time !!!

   #include <iostream>
#include<vector>
#include<stdio.h>


using namespace std;

int main()
{
    int t;
    int n;
    int i;
    scanf("%d %d",&t,&n);
    vector<long long int> a(n);
    for(int w=0;w<t;w++)
``{
    for(i=0;i<n;i++)
            scanf("%lld",&a[i]);

    long long int diff;
    diff=99999999999;

    for(i=0;i<n;i++)
        for(int j=i+1;j<n;j++)
    {
        long long int x=a[i]-a[j];
        if(x<0)
            x=-x;
    
        if(x<diff)
            diff=x;
    }
    printf("%lld",diff);
    }
    return 0;
}

Mistakes u did :

1.U have took no.of test cases(t) and length of d array(n) only once,whereas length of d array is different for different test cases !
2.Not printing answer in a new line…!

here is ur AC code : https://www.codechef.com/viewsolution/15539027…!

Happy coding : )

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