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### my code is giving right output but in codechef it is not giving right ans to all test cases ..LINK TO QUESTN (ZCO14002)... https://www.codechef.com/ZCOPRAC/problems/ZCO14002

``````#include<bits/stdc++.h>

#define ll long long int
#define mp make_pair
#define pb push_back

using namespace std;

ll a;

int main()
{
ll n,i,s,z,x,j,pos;
cin>>n;

for(i=0;i<200000;i++)
{
a[i]=100000;
}

s=0;

for(i=0;i<n;i++)
{
cin>>x;
a[i]=x;
}

if((a<=a)&&(a<=a))
{
i=0;
}

else if((a<=a)&&(a<=a))
{
i=1;
}

else
i=2;

//cout<<i<<" ";
s=s+a[i];

for(;i<n;)
{

if((a[i+1]<=a[i+2])&&(a[i+1]<=a[i+3]))
{
pos=i+1;
}

else if((a[i+2]<=a[i+1])&&(a[i+2]<=a[i+3]))
{
pos=i+2;
}

else
pos=i+3;

//cout<<a[pos]<<" "<<pos<<" ";

i=pos;

s=s+a[pos];

if(i>=(n-2))
break;

}

cout<<s;

return 0;
}
``````

Asked by: Manish_Kumar_Savita on April 7, 2019, 6:34 p.m. Last updated on April 7, 2019, 6:34 p.m.

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You have assumed that selection of minimum among the first three numbers will always give you optimal result. But it is not always correct.

For Test case:

``````5
1 2 3 4 1``````

Your code's output is 4, but the correct answer will be 3.

Ruchi_Singh last updated on April 7, 2019, 6:34 p.m.

the intuition behind your code is not correct. so, try to fix it.

note1 :) you should improve your skills regarding how to write code.

note2 :) you should explain the working of your program or how you think to solve the problem instead of just posting the code.

note 3:) always try some random test cases and corner cases before submitting the solution and don't just stick with test cases.

rishup132 last updated on April 7, 2019, 6:34 p.m.

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