 # ZCOPRAC Video Game Help Need in One Condition

I am trying to solve thisproblem. I have implemented the code but there seems to be some mistake with the logic that I am using. I think the problem is when c==4. Can you please help me figure this out.

``````using namespace std;

int main()
{
int n,h;
cin>>n>>h;
int a[n];
for(int i=0;i<n;i++)
cin>>a[i];
int c;
cin>>c;
int j=0;
while(c!=0)
{
bool isPicked = false;
if(c==1 && j>0)
{
j--;
}
if(c==2 && j<n-1)
{
j++;
}
if(c==3)
{
if(!isPicked && a[j] > 0)
{
isPicked = true;
a[j]--;
}
}
if(c==4)
{
if(isPicked && a[j] < h)
{
isPicked = false;
a[j]++;
}
}
cin>>c;
}

for(int i=0;i<n;i++)
cout<<a[i]<<" ";
return 0;
}
``````

In this problem, you just need to simulate the game process and output the answer…

You may have a look at my code here

There are a number of mistakes in your code…

First, when c == 4 && a[j}, add a[j]–

Second, when c == 2 && j != n-1 instead of j != n

Third, you are complicating your code…

Simply use if-else statements like

if(c==1){

}else if(c==2){

}else if(c==3){

}else if(c==4){

}else{

}

Your code is hard to understand and even harder to find bug… 1 Like

Your code is almost correct except a silly mistake-

``````int j=0;
while(c!=0)
{
bool isPicked = false;
``````

Every iteration you are setting isPicked=false. I think that statement should be out of while loop, because lets say you picked up a box and set isPicked=true. Then in the immediate next iteration you are setting it false, and this leads to error when drop operations are to be done.

Aside from that it seems fine. 1 Like

@taran_1407

Your code won’t be visible(403-Access Denied) as ZCOPRAC is still ongoing.

Oops…

Check here

https://pastebin.com/zw9Vde6q

can you please explain the c==4 part again?

@taran_1407 it should be a[j++] right?Also, I have updated my code still wrong answer

@vijju123 please bro… I am stuck at this problem for the last few days…

Can you please tell me how are you sure of WA? I cannot see you submitting the code anywhere. Need that to see your updated code. Thanks! @montycs You just need to realise that what information you need to simulate the whole game is current position and we are holding an item or not… (pos and hold variable in my code…

If c==1 pos-- if pos > 0 (move left if its not already of leftmost position…)

If c==2 pos++ if pos < N-1 (i have used 0-based indexing)

If c==3 pick up box if box[pos] >0 AND !hold

``````      box[pos]-- (reduced no of items in current box by one)

hold =true
``````

Similarly if c==4 drop if box[pos]<H AND hold = true

``````     Box[pos]++ (increased count of items by one)

hold = false``````

@vijju123 Sorry for not including that, here’s the link https://ideone.com/iO2txU

Thanks for that!

Thank you very much!!