Program Associate

int countWays(int n)
{
if(n == 1) return n;
int mod = 1000000000 + 7;
int prev = 2, prev2 = 1, curr = 0;

for(int i = 2 ; i < n ; i++){
curr = (prev + prev2) % mod;
prev2 = prev;
prev = curr;
}

return prev ;
}

#include 
using namespace std;

// Tree Node
struct Node {
int data;
Node *left;
Node *right;

Node(int val) {
data = val;
left = right = NULL;
}
};

// Function to Build Tree
Node* buildTree(string str)
{ 
// Corner Case
if(str.length() == 0 || str[0] == 'N')
return NULL;

// Creating vector of strings from input 
// string after spliting by space
vector ip;

istringstream iss(str);
for(string str; iss >> str; )
ip.push_back(str);

// Create the root of the tree
Node* root = new Node(stoi(ip[0]));

// Push the root to the queue
queue queue;
queue.push(root);

// Starting from the second element
int i = 1;
while(!queue.empty() && i < ip.size()) {

// Get and remove the front of the queue
Node* currNode = queue.front();
queue.pop();

// Get the current node's value from the string
string currVal = ip[i];

// If the left child is not null
if(currVal != "N") {

// Create the left child for the current node
currNode->left = new Node(stoi(currVal));

// Push it to the queue
queue.push(currNode->left);
}

// For the right child
i++;
if(i >= ip.size())
break;
currVal = ip[i];

// If the right child is not null
if(currVal != "N") {

// Create the right child for the current node
currNode->right = new Node(stoi(currVal));

// Push it to the queue
queue.push(currNode->right);
}
i++;
}

return root;
}


// } Driver Code Ends
/*The Node structure is defined as
struct Node {
int data;
Node *left;
Node *right;

Node(int val) {
data = val;
left = right = NULL;
}
};
*/

// return the Kth largest element in the given BST rooted at 'root'
class Solution
{public:
void solve(Node*root,int k,int&c,int &ans){
if(root==NULL||c>=k){
return ;
}
solve(root->right,k,c,ans);
c++;
if(c==k){
ans=root->data;
return;
}
solve(root->left,k,c,ans);
}
public:
int kthLargest(Node *root, int k)
{
int c=0;int ans;
solve(root,k,c,ans);
return ans;
}
};

// { Driver Code Starts.

int main()
{
int t;
cin>>t;
getchar();

while(t--)
{
string s;
getline(cin,s);
Node* head = buildTree(s);

int k;
cin>>k;
getchar();

Solution ob;
cout << ob.kthLargest( head, k ) << endl;
}
return 1;
} }

Tip 1:Try to give answer with the real life examples
Tip 2:Give answers in your own language and avoid the bookish language