def first_fit(memory_blocks, process_sizes):
    allocation = [-1] * len(process_sizes)

    for i in range(len(process_sizes)):
        for j in range(len(memory_blocks)):
            if memory_blocks[j] >= process_sizes[i]:
                allocation[i] = j
                memory_blocks[j] -= process_sizes[i]
                break

    print("\nFirst Fit Allocation:")
    for i in range(len(process_sizes)):
        if allocation[i] != -1:
            print(f"Process {i+1} allocated to Block {allocation[i]+1}")
        else:
            print(f"Process {i+1} not allocated")

# Example Memory Blocks and Process Sizes
memory_blocks = [100, 500, 200, 300, 600]
process_sizes = [212, 417, 112, 426]

first_fit(memory_blocks, process_sizes)