It gives me wrong answer although i did it correctly

general
1

I am trying to solve this easy problem CHEFRP Problem - CodeChef . Whenever i run on IDE it gives me correct output however when i try submitting the answer it shows wrong answer could someone please tell me whats wrong? here is my code

#include
using namespace std;

int main(void) {

int t,i,n,flag=1,count;
int *q=NULL;
cin>>t;

while(t--)
{
    cin>>n;
    q = new int[n];
    for(i=0;i<n;i++)
    {
        cin>>q[i];
    }
    for(i=0;i<n;i++)
    {
        if(q[i]>=2)
        {
         count=count+2;
        }
       else
        {
            flag=1;
        }
    }
    
    cout<<count<<endl;
   count=0;
    
    if(flag==0)
    {
        cout<<"-1";
    }
}


return 0;

}

2

You didn’t understood the question properly, the question asks maximum steps it can take to get 2 of every kind. The solution will be **

sum(of all elements in array) - min(element in array) + 2

for ele in array:
	if ele is less than 2 : flag=1
if flag==0: print sum(array) - min(array) + 2
else print "-1"
3

Too many mistakes…!!

Consider the input

Input:

2

3

3 2 4

2

2 1

Let us take first test case with N=3

your code’s output is 2 +2 +2 =6

But the correct answer is 3 +2 +4 =9

Mistake 1st:- Statement - “in the worst case so that it is guaranteed that she gets at least two units of each type of ingredient”.

You are not considering the worst case. She gets at least two units of each type of ingredient and not exactly two units.

Let us take second test case with N=2

your code’s output is 2 +0 =2

But the output should be -1

Mistake 2nd:- Statement - “get two units of each type ingredient”

When it is not possible to get even two units from each and every unit, then why are you bothering about the count?

Mistake 3rd:- When you are not equating/initializing the flag equal to zero anywhere in the code. How could you expect it to be zero, to print the answer -1 ?

NOTE:- You need so much practice buddy…!!

4

Okay thanks a lot I got my mistakes, i am a beginner as you rightly pointed out i need practice. Yes I will practice.