Class assignment problem

#1

link to problem

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


int calculate_numbers(int n){
if(n==1)
	return 2;
else if(n==2)
	return 3;
else
return calculate_numbers(n-1)+calculate_numbers(n-2);
}

int main(){

int t;
cin>>t;
while(t--){
int n;
cin>>n;
cout<<"#"<<n<<" : "<<calculate_numbers(n)<<endl;

}

}

`
I think this code should be correct
but I am getting wrong-answer error.
plz give some hints!

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#2

In the output
#1
represents output index and not n

#3

Yes Vikalp is right. Your output format is wrong. You have to output cout<<# Test case No << <<endl;

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#4

hey can u plz explain how u reached to such a crisp solution… i can not understand how your code works

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