First Fit | SO

import java.util.*;

/*
 * author : yufieko
 */

public class FirstFit {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        int size,kosong,pakai,proses,t_ksg = 0,t_pki = 0;
        boolean error;

        System.out.println(" ================== First Fit ==================");
        System.out.print(" Ukuran memori                  : "); size = input.nextInt();
        System.out.print(" Jumlah partisi memori kosong   : "); kosong = input.nextInt();
        System.out.print(" Jumlah partisi memori terpakai : "); pakai = input.nextInt();
        System.out.println(" -----------------------------------------------");

        System.out.println("\n Partisi Memori Kosong : input (awal akhir)");
        System.out.println(" -----------------------------------------------");

        int tksg[] = new int[kosong];
        int ksg[][] = new int[kosong][2];
        for(int i=0; i<kosong; i++){
            int j = 0;

            System.out.print(" Partisi-" + (i+1) + " : ");
            ksg[i][j] = input.nextInt();
            ksg[i][j+1] = input.nextInt();

            if(ksg[i][j] > size){
                i -= 1;
                System.out.println(" ! Batas awal melebihi ukuran");
            }else if(ksg[i][j+1] > size){
                i -= 1;
                System.out.println(" ! Batas akhir melebihi ukuran");
            }else{
                tksg[i] = ksg[i][j+1]-ksg[i][j];
                t_ksg = t_ksg + (ksg[i][j+1]-ksg[i][j]);
            }
        }

        System.out.println("\n Partisi Memori Terpakai : input (awal akhir)");
        System.out.println(" -----------------------------------------------");

        int tpki[] = new int[pakai];
        int pki[][] = new int[pakai][2];
        for(int i=0; i<pakai; i++){
            int j = 0;

            System.out.print(" Partisi-" + (i+1) + " : ");
            pki[i][j] = input.nextInt();
            pki[i][j+1] = input.nextInt();

            if(pki[i][j] > size){
                i -= 1;
                System.out.println(" ! Batas awal melebihi ukuran");
            }else if(pki[i][j+1] > size){
                i -= 1;
                System.out.println(" ! Batas akhir melebihi ukuran");
            }else{
                tpki[i] = pki[i][j+1]-pki[i][j];
                t_pki = t_pki + (pki[i][j+1]-pki[i][j]);
            }
        }

        System.out.println("\n Proses");
        System.out.println(" -----------------------------------------------");
        boolean penuh = false;
        int i = 0;
        while(!penuh){
            int j = 0, k = 0;
            System.out.println("\n Ukuran asli    : " + size);
            System.out.println(" Total kosong   : " + t_ksg);
            System.out.println(" Total terpakai : " + t_pki + "\n");

            for(int y=0; y<kosong; y++)
                System.out.println(" Partisi-" + (y+1) + " -> " + tksg[y]);

            System.out.println(" -----------------------------------------------");

            System.out.print(" > Proses-" + (i+1) + " (input ukuran) : ");
            proses = input.nextInt();

            boolean cek = false;
            int l = 0;
            while(l<kosong){
                if(tksg[l] >= proses){
                    System.out.println(" # Proses-" + (i+1) + " --> Partisi-" + (l+1) + " (kosong : " + tksg[l] + ")");
                    tksg[l] -= proses;
                    t_ksg -= proses;
                    t_pki += proses;
                    ksg[l][j] += proses;
                    System.out.println(" - Sisa Partisi-" + (l+1) + " = " + tksg[l]);
                    cek = true;
                    break;
                }else{
                    if(tksg[l] == 0) System.out.println(" ! Partisi-" + (l+1) + " penuh");
                    else System.out.println(" ! Partisi-" + (l+1) + " tidak cukup");
                    l++;
                }
            }

            if(!cek){
                System.out.println(" ! Permintaan Proses-" + (i+1) + " tidak bisa dipenuhi");
                i -= 1;
            }

            if(t_ksg == 0){
                System.out.println(" ! Memori penuh");
                System.out.println("\n Ukuran asli    : " + size);
                System.out.println(" Total kosong   : " + t_ksg);
                System.out.println(" Total terpakai : " + t_pki);
                penuh = true;
            }
            i++;
        }
    }
}
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