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say hello world with C++ - Solution in Hacker Rank - hackerranksolutions8

  Objective This is a simple challenge to help you practice printing to  stdout . You may also want to complete  Solve Me First  in C++ before attempting this challenge. We’re starting out by printing the most famous computing phrase of all time! In the editor below, use either  printf  or  cout  to print the string  Hello ,World!  to  stdout . The more popular command form is  cout . It has the following basic form: cout<<value_to_print<<value_to_print; Any number of values can be printed using one command as shown. The  printf  command comes from C language. It accepts an optional format specification and a list of variables. Two examples for printing a string are: printf("%s", string);   printf(string); Note that neither method adds a newline. It only prints what you tell it to. Output Format Print   Hello ,World!   to stdout. Sample Output Hello, World! Solution:- //Say Hello, ...
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Variable Sized Arrays in C++ – Solution in Hacker Rank - hackerranksolutions8

 

Problem

Consider an n-element array, a, where each index i in the array contains a reference to an array of ki integers (where the value of ki varies from array to array). See the Explanation section below for a diagram.
Given a, you must answer q queries. Each query is in the format i j, where i denotes an index in array a and j denotes an index in the array located at a[i] For each query, find and print the value of element j in the array at location a[i] on a new line.
Click here to know more about how to create variable sized arrays in C++.

Input Format

The first line contains two space-separated integers denoting the respective values of n (the number of variable-length arrays) and q (the number of queries).Each line i of the n subsequent lines contains a space-separated sequence in the format k a[i]0 a[i]1 … a[i]k-1 describing the k-element array located at a[i].
Each of the q subsequent lines contains two space-separated integers describing the respective values of i (an index in array a) and j (an index in the array referenced by a[i] for a query.

Constraints

  • 1<=n<=10^5
  • 1<=q<=10^5
  • 1<=k<=3.10^5
  • n<=k<=3.10^5
  • 0<=i<n
  • 0<=j<k
  • All indices in this challenge are zero-based.
  • All the given numbers are non negative and are not greater than 10^6

Output Format

For each pair of i and j values (i.e., for each query), print a single integer denoting the element located at index j of the array referenced by a[i]. There should be a total of q lines of output.

Sample Input :

2 2
3 1 5 4
5 1 2 8 9 3
0 1
1 3

Sample Output :

5
9

Explanation :

The diagram below depicts our assembled Sample Input:

Variable Sized Arrays in C++ - Hacker Rank Solution
  1. Find the array located at index i =0 , which corresponds to a[0] = [1,5,4]. We must print the value at index j=1 of this array which, as you can see, is 5.
  2. Find the array located at index i=1, which corresponds to a[1]=[1,2,8,9,3]. We must print the value at index j = 3 of this array which, as you can see, is 9.

Solution :-

#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#define MAX 1000
using namespace std;


int main() 
{
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */ 
    int arr1[MAX][MAX],size[MAX];
    int n,q,s,pos1,pos2;
    cout<<"Enter a Number of Array";
    cin>>n>>q; 
    for(int i=0;i<n;i++)
    {
       cout<<"Enter a size of array";
       cin>>s;
       for(int j=0;j<s;j++)
       {
            cin>>arr1[i][j];
       } 
        
    }
    for(int i=0;i<q;i++)
    {
        cout<<"Enter a position";
        cin>>pos1>>pos2;
        cout<<arr1[pos1][pos2]<<"\n";
    }
    return 0;
}
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