Dot and Cross in Python | HackerRank Solution

Hello coders, today we are going to solve Dot and Cross HackerRank Solution in Python.

Objective

dot

The dot tool returns the dot product of two arrays

import numpy

A = numpy.array([ 1, 2 ])
B = numpy.array([ 3, 4 ])

print numpy.dot(A, B)       #Output : 11

cross

The cross tool returns the cross product of two arrays.

import numpy

A = numpy.array([ 1, 2 ])
B = numpy.array([ 3, 4 ])

print numpy.cross(A, B)     #Output : -2

Task

You are given two arrays A and B. Both have dimensions of N X N.
Your task is to compute their matrix product.

Input Format

The first line contains the integer N.
The next N lines contains N space separated integers of array A.
The following N lines contains N space separated integers of array B.

Output Format

Print the matrix multiplication of A and B.

Sample Input

2
1 2
3 4
1 2
3 4

Sample Output

[[ 7 10]
 [15 22]]

Solution – Dot and Cross in Python

import numpy as np

n = int(input())
a = np.array([input().split() for _ in range(n)], int)
b = np.array([input().split() for _ in range(n)], int)
print(np.dot(a, b))

Disclaimer: The above Problem (Dot and Cross) is generated by Hacker Rank but the Solution is Provided by CodingBroz. This tutorial is only for Educational and Learning Purpose.