jahid

problem1

int main()
{
    int arr[1000],n,i,j,rev[1000];
    scanf("%d",&n);

    for(i=0;i<n;i++)
    {
        scanf("%d",&arr[i]);
        ///change
        rev[n-1-i]=arr[i];
    }
    for(j=0;j<n;j++)
    {
        printf("%d ",rev[j]);
    }
    return 0;
}

problem 2

#include<stdio.h>
int main()
{
    int t,i,j;
    long int a,b,mod;
    scanf("%d",&t);
    for(i=1; i<=t; i++)
    {
       scanf("%ld %ld",&a,&b);
       mod=a%b;
       if(mod!=0)
            printf("%d\n",b-mod);
        else
            printf("0\n");
    }

}

problem 3

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

int main()
{
    long long x, y, a, b,t;
    cin>>t;
    for(int i=0;i<t;i++)
    {
        cin>>x>>y>>a>>b;
        if((y-x)%(a+b)==0)
            cout<<(y-x)/(a+b)<<endl;
        else
            cout<<"-1"<<endl;
    }
}