public class Main {
    static int R = 7;
    static int C = 8;
    static int BONES = 30;
    static int N = 8;
    static int PIPS[][] = new int[N][N];
    static int answers;
    static int input[][] = new int[R][C];
    static int output[][];
    static int x1[] = {1, 0};
    static int y1[] = {0, 1};
    static boolean isValid[];
    static int EOF;
    
    public static void bones(){
        int val = 1;
        for(int i = 0; i<7; i++){
            for(int j = i; j<7; j++){
                PIPS[i][j] = PIPS[j][i] = val++;
            }
        }
    }
    
    public static void domino(int x, int y, int count){
        if(count == 28){
            for(int i = 0; i<R ; i++){
                for(int j = 0; j<C; j++){
                    System.out.print("\t"+output[i][j]);
                }
                System.out.println();
            }
            System.out.println();
            answers++;
            EOF = 1;
            return;
        }
        if(x > 7 || y > 8){
            return;
        }
        if(y == 8){
            x+=1;
            y=0;
        }
        if(output[x][y] != 0){
            domino(x, y+1, count);
        }
        for(int i = 0; i < 2; i++){
            int x2 = x + x1[i];
            int y2 = y + y1[i];
            if(x < 7 && x2 < 7 && y < 8 && y2 < 8){
                int num = PIPS[input[x][y]][input[x2][y2]];
                    if(output[x][y] == 0 && output[x2][y2] == 0 && !isValid[num]){
                output[x][y] = num;
                output[x2][y2] = num;
                isValid[num] = true;
                domino(x, y+1, count+1);
                output[x][y] = 0;
                output[x2][y2] = 0;
                isValid[num] = false;
                    }
            }
        }
    }
    
    public static void main(String[] str){
        Scanner scan = new Scanner(System.in);
        int n = 0;
        bones();
        String sb = "a";
        while(scan.hasNext()){
            output = new int[R][C];
            isValid = new boolean[BONES];
            answers = 0;
            EOF = 0;
            n+=1;
            for(int i = 0; i<R; i++){
                for(int j = 0; j<C; j++){
                    input[i][j] = scan.nextInt();
                }
            }
            System.out.print("\n\n\nLayout #" +n+":\n\n");
            for(int i = 0; i<R; i++){
                for(int j = 0; j<C; j++){
                    System.out.print("\t"+input[i][j]);
                }
                System.out.println();
            }
            System.out.print("\nMaps resulting from layout #" +n+" are:\n\n");
            domino(0, 0, 0);
            System.out.print("There are "+answers+" solution(s) for layout #" +n+"\n");
            
        }
    }
}
by

C++ Online Compiler

Write, Run & Share C++ code online using OneCompiler's C++ online compiler for free. It's one of the robust, feature-rich online compilers for C++ language, running on the latest version 17. Getting started with the OneCompiler's C++ compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as C++ and start coding!

Read inputs from stdin

OneCompiler's C++ online compiler supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample program which takes name as input and print your name with hello.

#include <iostream>
#include <string>
using namespace std;

int main() 
{
    string name;
    cout << "Enter name:";
    getline (cin, name);
    cout << "Hello " << name;
    return 0;
}

About C++

C++ is a widely used middle-level programming language.

  • Supports different platforms like Windows, various Linux flavours, MacOS etc
  • C++ supports OOPS concepts like Inheritance, Polymorphism, Encapsulation and Abstraction.
  • Case-sensitive
  • C++ is a compiler based language
  • C++ supports structured programming language
  • C++ provides alot of inbuilt functions and also supports dynamic memory allocation.
  • Like C, C++ also allows you to play with memory using Pointers.

Syntax help

Loops

1. If-Else:

When ever you want to perform a set of operations based on a condition If-Else is used.

if(conditional-expression) {
   //code
}
else {
   //code
}

You can also use if-else for nested Ifs and If-Else-If ladder when multiple conditions are to be performed on a single variable.

2. Switch:

Switch is an alternative to If-Else-If ladder.

switch(conditional-expression){    
case value1:    
 // code    
 break;  // optional  
case value2:    
 // code    
 break;  // optional  
......    
    
default:     
 code to be executed when all the above cases are not matched;    
}

3. For:

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement){  
  //code  
}

4. While:

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

while (condition) {  
// code 
}

5. Do-While:

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

do {  
 // code 
} while (condition);

Functions

Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity. Function gets run only when it is called.

How to declare a Function:

return_type function_name(parameters);

How to call a Function:

function_name (parameters)

How to define a Function:

return_type function_name(parameters) {  
 // code
}