HackerRank: Day 1: Data Types in C++

They are asking me to declare 3 variables, one for integer, one for double and one for string. Then read 3 lines of input from stdin. I have posted up my solution but it is not working. I don't know why my variable for string is not reading from the stdin. When I try it in the VSCODE, it is working. Can you tell me what am I doing wrong?

Here is the problem

Sample input:

12
4.0    
is the best place to learn and practice coding!

Sample output:

16
8.0
HackerRank is the best place to learn and practice coding!

This is the code I use to check in my VSCODE. This works! But it doesn't work in HackerRank website.

#include <iostream>
#include <iomanip>
#include <limits>

using namespace std;

int main() {
    int i = 4;
    double d = 4.0;
    string s = "HackerRank ";


    // Declare second integer, double, and String variables.int x;
    int x;
    double y;
    string str;
    // Read and save an integer, double, and String to your variables.
    cin >> x;
    cin >> y;
    getline(cin, str);

    // Note: If you have trouble reading the entire string, please go back and review the Tutorial closely.

    // Print the sum of both integer variables on a new line.
    cout << x + i << endl;
    // Print the sum of the double variables on a new line.
    cout << y + d << endl;
    // Concatenate and print the String variables on a new line
    // The 's' variable above should be printed first.
    cout << s + str << endl;

    return 0;
}

After reading input using std::cin, there will be an extra line left which is read by the getline() everytime.
Try using std::cin.ignore() before reading the string.
It will ignore the extra line.

std::cin>>x;
std::cin.ignore();
std::getline(std::cin,str);