Questions
- Print all paths in a binary tree
- Function to find the square root of a number
- Pretty print JSON object
- How would you design home feed?
- Simple regex matcher

Question

Questions
- Print all paths in a binary tree
- Function to find the square root of a number
- Pretty print JSON object
- How would you design home feed?
- Simple regex matcher

rsingh0604 · Accepted Answer

printing all path in binary tree

//printing all the path from root to leaf using recursion
		public void printRooToLeaf(Node X,List Path){
			      if(X==null) return;
			            Path.add(X);
						printRooToLeaf(X.leftChild,Path);
			           printRooToLeaf(X.rightChild,Path);
			if(X.leftChild==null && X.rightChild==null) {
				System.out.println("print path from root :"+ root.a+"to leaf"+X.a);
				for(Node y:Path){
					System.out.println(""+y.a);
				}
				System.out.println();

			}

			Path.remove(Path.size()-1);

			
			
		}

All the paths · Answer

class TreeNode(object):
    def __init__(self, v, l=None, r=None):
        self.v = v
        self.l = r
        self.r = l

    def get_paths(self, path=[]):
        result = []
        new_path = path[:]
        new_path.append(self.v)
        if self.l is None and self.r is None:
            return [new_path]

        if self.l != None:
            result += self.l.get_paths(new_path)
        if self.r != None:
            result += self.r.get_paths(new_path)

        return result

#     4
#     /\
#    3  6
#   /\  /\
#  8 9 7  2
# /   \
#1     0
a1 = TreeNode(1)
a8 = TreeNode(8, a1)
a0 = TreeNode(0)
a9 = TreeNode(9, r=a0)
a3 = TreeNode(3, a8, a9)

a7 = TreeNode(7)
a2 = TreeNode(2)
a6 = TreeNode(6, a7, a2)
root = TreeNode(4, a3, a6)

print root.get_paths()

Python Square root using Newton method · Answer

def square_root(num, precission=0.001):
    pow_two = 1

    x = num
    while abs(num-pow_two) > precission:
        pow_two = x*x
        x -= (pow_two - num) / (2.0 * x)

    return x

print square_root(4)
print square_root(10)
print square_root(3)

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