Check out example codes for "best fit algorithm". It will help you in understanding the concepts better.

Code Example 1

// C++ implementation of Best - Fit algorithm 
#include<bits/stdc++.h> 
using namespace std; 
  
// Function to allocate memory to blocks as per Best fit 
// algorithm 
void bestFit(int blockSize[], int m, int processSize[], int n) 
{ 
    // Stores block id of the block allocated to a 
    // process 
    int allocation[n]; 
  
    // Initially no block is assigned to any process 
    memset(allocation, -1, sizeof(allocation)); 
  
    // pick each process and find suitable blocks 
    // according to its size ad assign to it 
    for (int i=0; i<n; i++) 
    { 
        // Find the best fit block for current process 
        int bestIdx = -1; 
        for (int j=0; j<m; j++) 
        { 
            if (blockSize[j] >= processSize[i]) 
            { 
                if (bestIdx == -1) 
                    bestIdx = j; 
                else if (blockSize[bestIdx] > blockSize[j]) 
                    bestIdx = j; 
            } 
        } 
  
        // If we could find a block for current process 
        if (bestIdx != -1) 
        { 
            // allocate block j to p[i] process 
            allocation[i] = bestIdx; 
  
            // Reduce available memory in this block. 
            blockSize[bestIdx] -= processSize[i]; 
        } 
    } 
  
    cout << "\nProcess No.\tProcess Size\tBlock no.\n"; 
    for (int i = 0; i < n; i++) 
    { 
        cout << "   " << i+1 << "\t\t" << processSize[i] << "\t\t"; 
        if (allocation[i] != -1) 
            cout << allocation[i] + 1; 
        else
            cout << "Not Allocated"; 
        cout << endl; 
    } 
}

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