# Divide cuboid into cubes such that sum of volumes is maximum

Given the **length**, **breadth**, **height** of a cuboid. The task is to divide the given cuboid in minimum number of cubes such that size of all cubes is same and sum of volumes of cubes is maximum.

Examples:

Input : l = 2, b = 4, h = 6 Output : 2 6 A cuboid of length 2, breadth 4 and height 6 can be divided into 6 cube of side equal to 2. Volume of cubes = 6*(2*2*2) = 6*8 = 48. Volume of cuboid = 2*4*6 = 48. Input : 1 2 3 Output : 1 6

First of all, we are not allowed to waste volume of cuboid as we meed maximum volume sum. So, each side should be completely divide among all cubes. And since each of three side of cubes are equal, so each side of the cuboid need to be divisible by same number, say x, which will going to be the side of the cube. So, we have to maximize this x, which will divide given length, breadth and height. This x will be maximum only if it is greatest common divisor of given length, breadth and height. So, the length of the cube will be GCD of length, breadth and height.

Now, to compute number of cubes, we know total volume of cuboid and can find volume of one cube (since side is already calculated). So, total number of cubes is equal to (volume of cuboid)/(volume of cube) i.e (l * b * h)/(x * x * x).

Below is implementation of this approach:

## C++

`// CPP program to find optimal way to break` `// cuboid into cubes.` `#include <bits/stdc++.h>` `using` `namespace` `std;` `// Print the maximum side and no of cube.` `void` `maximizecube(` `int` `l, ` `int` `b, ` `int` `h)` `{` ` ` `// GCD to find side.` ` ` `int` `side = __gcd(l, __gcd(b, h));` ` ` `// dividing to find number of cubes.` ` ` `int` `num = l / side;` ` ` `num = (num * b / side);` ` ` `num = (num * h / side);` ` ` `cout << side << ` `" "` `<< num << endl;` `}` `// Driver code` `int` `main()` `{` ` ` `int` `l = 2, b = 4, h = 6;` ` ` `maximizecube(l, b, h);` ` ` `return` `0;` `}` |

## Java

`// JAVA Code for Divide cuboid into cubes ` `// such that sum of volumes is maximum` `import` `java.util.*;` `class` `GFG {` ` ` ` ` `static` `int` `gcd(` `int` `m, ` `int` `n)` ` ` `{` ` ` `if` `(n == ` `0` `) ` ` ` `return` `m;` ` ` `else` `if` `(n > m) ` ` ` `return` `gcd(n,m);` ` ` `else` ` ` `return` `gcd(n, m % n);` ` ` `}` ` ` ` ` `// Print the maximum side and no` ` ` `// of cube.` ` ` `static` `void` `maximizecube(` `int` `l, ` `int` `b,` ` ` `int` `h)` ` ` `{` ` ` `// GCD to find side.` ` ` `int` `side = gcd(l, gcd(b, h));` ` ` ` ` `// dividing to find number of cubes.` ` ` `int` `num = l / side;` ` ` `num = (num * b / side);` ` ` `num = (num * h / side);` ` ` ` ` `System.out.println( side + ` `" "` `+ num);` ` ` `}` ` ` ` ` `/* Driver program */` ` ` `public` `static` `void` `main(String[] args) ` ` ` `{` ` ` `int` `l = ` `2` `, b = ` `4` `, h = ` `6` `;` ` ` `maximizecube(l, b, h);` ` ` `}` `}` `// This code is contributed by Arnav Kr. Mandal.` |

## Python3

`# Python3 code to find optimal way to break` `# cuboid into cubes.` `from` `fractions ` `import` `gcd` `# Print the maximum side and no of cube.` `def` `maximizecube( l , b , h ):` ` ` `# GCD to find side.` ` ` `side ` `=` `gcd(l, gcd(b, h))` ` ` ` ` `# dividing to find number of cubes.` ` ` `num ` `=` `int` `(l ` `/` `side)` ` ` `num ` `=` `int` `(num ` `*` `b ` `/` `side)` ` ` `num ` `=` `int` `(num ` `*` `h ` `/` `side)` ` ` ` ` `print` `(side, num)` `# Driver code` `l ` `=` `2` `b ` `=` `4` `h ` `=` `6` `maximizecube(l, b, h)` `# This code is contributed by "Sharad_Bhardwaj".` |

## C#

`// C# Code for Divide cuboid into cubes ` `// such that sum of volumes is maximum` `using` `System;` `class` `GFG {` ` ` ` ` `static` `int` `gcd(` `int` `m, ` `int` `n)` ` ` `{` ` ` `if` `(n == 0) ` ` ` `return` `m;` ` ` `else` `if` `(n > m) ` ` ` `return` `gcd(n,m);` ` ` `else` ` ` `return` `gcd(n, m % n);` ` ` `}` ` ` ` ` `// Print the maximum side and no` ` ` `// of cube.` ` ` `static` `void` `maximizecube(` `int` `l, ` `int` `b,` ` ` `int` `h)` ` ` `{` ` ` `// GCD to find side.` ` ` `int` `side = gcd(l, gcd(b, h));` ` ` ` ` `// dividing to find number of cubes.` ` ` `int` `num = l / side;` ` ` `num = (num * b / side);` ` ` `num = (num * h / side);` ` ` ` ` `Console.WriteLine( side + ` `" "` `+ num);` ` ` `}` ` ` ` ` `/* Driver program */` ` ` `public` `static` `void` `Main() ` ` ` `{` ` ` `int` `l = 2, b = 4, h = 6;` ` ` `maximizecube(l, b, h);` ` ` `}` `}` `// This code is contributed by vt_m.` |

## PHP

`<?php` `// PHP program to find optimal way ` `// to break cuboid into cubes.` `// Recursive function to ` `// return gcd of a and b` `function` `__gcd(` `$a` `, ` `$b` `)` `{` ` ` ` ` `// Everything divides 0` ` ` `if` `(` `$a` `== 0 ` `or` `$b` `== 0)` ` ` `return` `0 ;` ` ` `// base case` ` ` `if` `(` `$a` `== ` `$b` `)` ` ` `return` `$a` `;` ` ` ` ` `// a is greater` ` ` `if` `(` `$a` `> ` `$b` `)` ` ` `return` `__gcd(` `$a` `- ` `$b` `, ` `$b` `) ;` ` ` `return` `__gcd(` `$a` `, ` `$b` `- ` `$a` `) ;` `}` `// Print the maximum side and no of cube.` `function` `maximizecube(` `$l` `, ` `$b` `, ` `$h` `)` `{` ` ` ` ` `// GCD to find side.` ` ` `$side` `= __gcd(` `$l` `, __gcd(` `$b` `, ` `$h` `));` ` ` `// dividing to find number of cubes.` ` ` `$num` `= ` `$l` `/ ` `$side` `;` ` ` `$num` `= (` `$num` `* ` `$b` `/ ` `$side` `);` ` ` `$num` `= (` `$num` `* ` `$h` `/ ` `$side` `);` ` ` `echo` `$side` `, ` `" "` `, ` `$num` `;` `}` ` ` `// Driver code` ` ` `$l` `= 2;` ` ` `$b` `= 4;` ` ` `$h` `= 6;` ` ` `maximizecube(` `$l` `, ` `$b` `, ` `$h` `);` ` ` `// This code is contributed by anuj_67.` `?>` |

## Javascript

`<script>` `// JavaScript program for Divide cuboid into cubes ` `// such that sum of volumes is maximum` ` ` `function` `gcd(m, n)` ` ` `{` ` ` `if` `(n == 0) ` ` ` `return` `m;` ` ` `else` `if` `(n > m) ` ` ` `return` `gcd(n,m);` ` ` `else` ` ` `return` `gcd(n, m % n);` ` ` `}` ` ` ` ` `// Print the maximum side and no` ` ` `// of cube.` ` ` `function` `maximizecube(l, b, h)` ` ` `{` ` ` ` ` `// GCD to find side.` ` ` `let side = gcd(l, gcd(b, h));` ` ` ` ` `// dividing to find number of cubes.` ` ` `let num = l / side;` ` ` `num = (num * b / side);` ` ` `num = (num * h / side);` ` ` ` ` `document.write( side + ` `" "` `+ num);` ` ` `} ` ` ` `// Driver code ` ` ` `let l = 2, b = 4, h = 6;` ` ` `maximizecube(l, b, h);` ` ` ` ` `// This code is contributed by sanjoy_62.` `</script>` |

Output:

2 6

**Time Complexity:** O(log_{2}n), where n is the upper limit of b and h.**Auxiliary Space: **O(1)

Please suggest if someone has a better solution which is more efficient in terms of space and time.

This article is contributed by **Aarti_Rathi**. Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above

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