the output is throwing large numbers-CodePudding

the question is: Chef has gone shopping with his 5-year old son. They have bought N items so far. The items are numbered from 1 to N, and the item i weighs Wi grams.

Chef's son insists on helping his father in carrying the items. He wants his dad to give him a few items. Chef does not want to burden his son. But he won't stop bothering him unless he is given a few items to carry. So Chef decides to give him some items. Obviously, Chef wants to give the kid less weight to carry.

However, his son is a smart kid. To avoid being given the bare minimum weight to carry, he suggests that the items are split into two groups, and one group contains exactly K items. Then Chef will carry the heavier group, and his son will carry the other group.

Help the Chef in deciding which items should the son take. Your task will be simple. Tell the Chef the maximum possible difference between the weight carried by him and the weight carried by the kid.Chef has gone shopping with his 5-year old son. They have bought N items so far. The items are numbered from 1 to N, and the item i weighs Wi grams.

Help the Chef in deciding which items should the son take. Your task will be simple. Tell the Chef the maximum possible difference between the weight carried by him and the weight carried by the kid.

Input:

The first line of input contains an integer T, denoting the number of test cases. Then T test cases follow. The first line of each test contains two space-separated integers N and K. The next line contains N space-separated integers W1, W2, ..., WN.

Output:

For each test case, output the maximum possible difference between the weights carried by both in grams.

Sample Input 1

5 2

8 4 5 2 10

8 3

1 1 1 1 1 1 1 1

Sample Output 1

Explanation

Case #1: The optimal way is that Chef gives his son K=2 items with weights 2 and 4. Chef carries the rest of the items himself. Thus the difference is: (8 5 10) ? (4 2) = 23 ? 6 = 17.

Case #2: Chef gives his son 3 items and he carries 5 items himself.

my code is:

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

int main() {
    int t=0,n=0,k=0,j=0;
    cin>>t;
    while(t--){
        cin>>n>>k;
        int arr[n],son=0,father=0;
        for(int i=0;i<n;i  ){
            cin>>arr[n];
        }
        sort(arr,arr n);
        
        for(j=0;j<n;j  ){
            if(j>=n-1-k){
                father =arr[j];
            }
            else{
                son =arr[j];
            }
        }
        cout<<father-son<<endl;
    }
    return 0;
}

the ouput im getting is this: 1007357324

1389213724

CodePudding user response：

you are getting bigger numbers because on this line

for(int i=0;i<n;i  ){
    cin>>arr[n];
}

You are changing the value on arr[n] (that doesn't exist because you array goes from 0 to n-1). Basically you are not changing any value inside the array so its using trash values that were stored on the memory.

The fix to not get those big number is change the line cin>>arr[n]; to cin>>arr[i];. I didnt test your code to check if you will have a correct answer to the problem that you are trying to solve but the big numbers will go away.

Cheers!