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# Maximum volume of cube for every person when edge of N cubes are given

• Last Updated : 09 Aug, 2021

Given an array of N integers which denotes the edges of N cubical structures respectively. Also given are M integers which denote the number of peoples. The task is to find the maximum amount of volume of a cube that can be given to every person.
Note: Cubes can be cut off any shape from any of the N cubes.
Examples:

Input: a[] = {1, 1, 1, 2, 2}, m = 3
Output:
All three people get a slice of volume 4 each
Person 1 gets a slice of volume 4 from the last cube.
Person 2 gets a slice of volume 4 from the last cube.
Person 3 gets a slice of volume 4 from the second last cube.
Input: a[] = {2, 2, 2, 2, 2}, m = 4
Output:

Naive Approach: A naive approach is to first calculate the volume of all the cubes and then linearly check for every volume that it can be distributed among all M people or not and find the maximum volume among all such volumes.
Time Complexity: O(N2)

Efficient Approach: An efficient approach is to use binary search to find the answer. Since the edge lengths are given in the array, convert them to the volume of the respective cubes. Find the maximum volume among the volumes of all the cubes. Say, the maximum volume is maxVolume. Now, perform binary search on the range [0, maxVolume].

• Calculate the middle value of the range, say mid.
• Now, calculate the total number of cubes that can be cut of all the cubes of volume mid.
• If the total cubes that can be cut exceed the number of persons, then that amount of volume of cubes can be cut for every person, hence we check for a larger value in the range [mid+1, maxVolume].
• If the total cubes do not exceed the number of persons, then we check for an answer in the range [low, mid-1].

Below is the implementation of the above approach:

## C++

 `// C++ program to implement the above approach` `#include ``using` `namespace` `std;` `// Function to get the maximum volume that``// every person can get``int` `getMaximumVloume(``int` `a[], ``int` `n, ``int` `m)``{``    ``int` `maxVolume = 0;` `    ``// Convert the length to respective volumes``    ``// and find the maximum volumes``    ``for` `(``int` `i = 0; i < n; i++) {``        ``a[i] = a[i] * a[i] * a[i];` `        ``maxVolume = max(a[i], maxVolume);``    ``}` `    ``// Apply binary search with initial``    ``// low as 0 and high as the maximum most``    ``int` `low = 0, high = maxVolume;` `    ``// Initial answer is 0 slices``    ``int` `maxVol = 0;` `    ``// Apply binary search``    ``while` `(low <= high) {` `        ``// Get the mid element``        ``int` `mid = (low + high) >> 1;` `        ``// Count the slices of volume mid``        ``int` `cnt = 0;``        ``for` `(``int` `i = 0; i < n; i++) {``            ``cnt += a[i] / mid;``        ``}` `        ``// If the slices of volume``        ``// exceeds the number of persons``        ``// then every person can get volume mid``        ``if` `(cnt >= m) {` `            ``// Then check for larger in the right half``            ``low = mid + 1;` `            ``// Replace tbe answer with``            ``// current maximum i.e., mid``            ``maxVol = max(maxVol, mid);``        ``}` `        ``// else traverse in the left half``        ``else``            ``high = mid - 1;``    ``}` `    ``return` `maxVol;``}` `// Driver code``int` `main()``{``    ``int` `a[] = { 1, 1, 1, 2, 2 };``    ``int` `n = ``sizeof``(a) / ``sizeof``(a);``    ``int` `m = 3;` `    ``cout << getMaximumVloume(a, n, m);` `    ``return` `0;``}`

## Java

 `// Java program to implement the above approach``class` `GFG``{` `    ``// Function to get the maximum volume that``    ``// every person can get``    ``static` `int` `getMaximumVloume(``int` `a[], ``int` `n, ``int` `m)``    ``{``        ``int` `maxVolume = ``0``;` `        ``// Convert the length to respective volumes``        ``// and find the maximum volumes``        ``for` `(``int` `i = ``0``; i < n; i++)``        ``{``            ``a[i] = a[i] * a[i] * a[i];` `            ``maxVolume = Math.max(a[i], maxVolume);``        ``}` `        ``// Apply binary search with initial``        ``// low as 0 and high as the maximum most``        ``int` `low = ``0``, high = maxVolume;` `        ``// Initial answer is 0 slices``        ``int` `maxVol = ``0``;` `        ``// Apply binary search``        ``while` `(low <= high)``        ``{` `            ``// Get the mid element``            ``int` `mid = (low + high) >> ``1``;` `            ``// Count the slices of volume mid``            ``int` `cnt = ``0``;``            ``for` `(``int` `i = ``0``; i < n; i++)``            ``{``                ``cnt += a[i] / mid;``            ``}` `            ``// If the slices of volume``            ``// exceeds the number of persons``            ``// then every person can get volume mid``            ``if` `(cnt >= m)``            ``{` `                ``// Then check for larger in the right half``                ``low = mid + ``1``;` `                ``// Replace tbe answer with``                ``// current maximum i.e., mid``                ``maxVol = Math.max(maxVol, mid);``            ``}``            ` `            ``// else traverse in the left half``            ``else``            ``{``                ``high = mid - ``1``;``            ``}``        ``}` `        ``return` `maxVol;``    ``}` `    ``// Driver code``    ``public` `static` `void` `main(String[] args)``    ``{``        ``int` `a[] = {``1``, ``1``, ``1``, ``2``, ``2``};``        ``int` `n = a.length;``        ``int` `m = ``3``;` `        ``System.out.println(getMaximumVloume(a, n, m));``    ``}``}` `// This code is contributed by 29AjayKumar`

## Python3

 `# Python 3 program to implement``# the above approach` `# Function to get the maximum volume``# that every person can get``def` `getMaximumVloume(a, n, m):``    ``maxVolume ``=` `0` `    ``# Convert the length to respective``    ``# volumes and find the maximum volumes``    ``for` `i ``in` `range``(n):``        ``a[i] ``=` `a[i] ``*` `a[i] ``*` `a[i]` `        ``maxVolume ``=` `max``(a[i], maxVolume)` `    ``# Apply binary search with initial``    ``# low as 0 and high as the maximum most``    ``low ``=` `0``    ``high ``=` `maxVolume` `    ``# Initial answer is 0 slices``    ``maxVol ``=` `0` `    ``# Apply binary search``    ``while` `(low <``=` `high):``        ` `        ``# Get the mid element``        ``mid ``=` `(low ``+` `high) >> ``1` `        ``# Count the slices of volume mid``        ``cnt ``=` `0``        ``for` `i ``in` `range``(n):``            ``cnt ``+``=` `int``(a[i] ``/` `mid)` `        ``# If the slices of volume``        ``# exceeds the number of persons``        ``# then every person can get volume mid``        ``if` `(cnt >``=` `m):``            ` `            ``# Then check for larger in the right half``            ``low ``=` `mid ``+` `1` `            ``# Replace tbe answer with``            ``# current maximum i.e., mid``            ``maxVol ``=` `max``(maxVol, mid)` `        ``# else traverse in the left half``        ``else``:``            ``high ``=` `mid ``-` `1` `    ``return` `maxVol` `# Driver code``if` `__name__ ``=``=` `'__main__'``:``    ``a ``=` `[``1``, ``1``, ``1``, ``2``, ``2``]``    ``n ``=` `len``(a)``    ``m ``=` `3` `    ``print``(getMaximumVloume(a, n, m))` `# This code is contributed``# by Surendra_Gangwar`

## C#

 `// C# program to implement the above approach``using` `System;` `class` `GFG``{` `    ``// Function to get the maximum volume that``    ``// every person can get``    ``static` `int` `getMaximumVloume(``int` `[]a, ``int` `n, ``int` `m)``    ``{``        ``int` `maxVolume = 0;` `        ``// Convert the length to respective volumes``        ``// and find the maximum volumes``        ``for` `(``int` `i = 0; i < n; i++)``        ``{``            ``a[i] = a[i] * a[i] * a[i];` `            ``maxVolume = Math.Max(a[i], maxVolume);``        ``}` `        ``// Apply binary search with initial``        ``// low as 0 and high as the maximum most``        ``int` `low = 0, high = maxVolume;` `        ``// Initial answer is 0 slices``        ``int` `maxVol = 0;` `        ``// Apply binary search``        ``while` `(low <= high)``        ``{` `            ``// Get the mid element``            ``int` `mid = (low + high) >> 1;` `            ``// Count the slices of volume mid``            ``int` `cnt = 0;``            ``for` `(``int` `i = 0; i < n; i++)``            ``{``                ``cnt += a[i] / mid;``            ``}` `            ``// If the slices of volume``            ``// exceeds the number of persons``            ``// then every person can get volume mid``            ``if` `(cnt >= m)``            ``{` `                ``// Then check for larger in the right half``                ``low = mid + 1;` `                ``// Replace tbe answer with``                ``// current maximum i.e., mid``                ``maxVol = Math.Max(maxVol, mid);``            ``}``            ` `            ``// else traverse in the left half``            ``else``            ``{``                ``high = mid - 1;``            ``}``        ``}` `        ``return` `maxVol;``    ``}` `    ``// Driver code``    ``public` `static` `void` `Main(String[] args)``    ``{``        ``int` `[]a = {1, 1, 1, 2, 2};``        ``int` `n = a.Length;``        ``int` `m = 3;` `        ``Console.WriteLine(getMaximumVloume(a, n, m));``    ``}``}` `/* This code contributed by PrinciRaj1992 */`

## PHP

 `> 1;` `        ``// Count the slices of volume mid``        ``\$cnt` `= 0;``        ``for` `(``\$i` `= 0; ``\$i` `< ``\$n``; ``\$i``++)``        ``{``            ``\$cnt` `+= (int)(``\$a``[``\$i``] / ``\$mid``);``        ``}` `        ``// If the slices of volume``        ``// exceeds the number of persons``        ``// then every person can get volume mid``        ``if` `(``\$cnt` `>= ``\$m``)``        ``{` `            ``// Then check for larger in the right half``            ``\$low` `= ``\$mid` `+ 1;` `            ``// Replace tbe answer with``            ``// current maximum i.e., mid``            ``\$maxVol` `= max(``\$maxVol``, ``\$mid``);``        ``}` `        ``// else traverse in the left half``        ``else``            ``\$high` `= ``\$mid` `- 1;``    ``}` `    ``return` `\$maxVol``;``}` `// Driver code``\$a` `= ``array``(1, 1, 1, 2, 2);``\$n` `= sizeof(``\$a``);``\$m` `= 3;` `echo` `getMaximumVloume(``\$a``, ``\$n``, ``\$m``);` `// This code is contributed by Akanksha Rai``?>`

## Javascript

 ``
Output:
`4`

Time Complexity: O(N * log (maxVolume))

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