java solution Usaco milk the cow code example

Example: java solution milk the cow

import java.util.*;
import java.io.*;
/*
ID: coconut
LANG: JAVA
TASK: milk2
*/
public class milk2 {
    static farmer[] farmers;
    public static void main(String[] args) throws Exception  {
        Scanner sc = new Scanner(new File("milk2.in"));
        farmers = new farmer[sc.nextInt()];    
        for (int i = 0; i < farmers.length; i++){
            int temp = sc.nextInt();
            int temp2 = sc.nextInt();
            farmers[i] = new farmer(temp, temp2);
        }
            
        sc.close();
        //
        int longestMilk = longestMilk();
        int longestNoMilk = longestNoMilk();
        //
        PrintWriter out = new PrintWriter(new File("milk2.out"));
        out.print(longestMilk + " ");
        out.println(longestNoMilk + "");
        out.close();
    }
    static int longestMilk() {
        mergeSort(farmers);
         int[] allInterval = new int[farmers.length];
         int lastMAX = -1;
         int lastIndex = 0;
         for(int i = 0;i < farmers.length; i++) { 
             
             if(lastMAX >= farmers[i].start) {
                 if( farmers[i].end > lastMAX){
                     allInterval[lastIndex] += farmers[i].end - lastMAX;
                     lastMAX = farmers[i].end;
                 }
                     
                
             } else {
                 //create a new interval
                 allInterval[i] = farmers[i].end - farmers[i].start;
                 lastMAX = farmers[i].end;
                 lastIndex = i;
             }
            
         }
         lastMAX = -1;
        
         for(int i : allInterval){
             if(i > lastMAX)
                lastMAX = i;
         }
         return lastMAX;
            
    }
    static int longestNoMilk() {
        int[] aMI = new int[farmers.length * 2];
        Arrays.fill(aMI, -1);
        int point = 0;
        for(farmer i : farmers){
            boolean newIn = true;
            for(int j = 0; j < point; j+=2){
                 
                 if(aMI[j] == i.start){
                    if(aMI[j+1] < i.end)
                         aMI[j+1] = i.end;
                    newIn = false;
                    break; 
                    
                        
                 } else if (i.start > aMI[j] && i.start < aMI[j+1]) {
                     if(i.end > aMI[j+1])
                         aMI[j+1] = i.end;
                    newIn = false;
                     break;
                 } else if (i.start < aMI[j] && i.end > aMI[j]){
                     if(i.end > aMI[j+1])
                        aMI[j+1] = i.end;
                     newIn = false;
                     break;
                 }
            }
            if (newIn){
                aMI[point++] = i.start;
                aMI[point++] = i.end;
            }
             
        }
        //point -> smol
        point = -1;
        int biggestNoCow = 0;
        for(int i = 1; i < aMI.length; i++){ 
            if(point == -1)
                point = aMI[i];
            else {
                int temp = Math.max(0, aMI[i] - point);
                if(temp >biggestNoCow)
                    biggestNoCow = temp;
                point = -1;
            }
        }
        return biggestNoCow;
    }
    static void mergeSort(farmer[] list){
        if(list.length > 1) {
			farmer[] firstHalf = new farmer[list.length/2];
			farmer[] secondHalf = new farmer[list.length - firstHalf.length];
			System.arraycopy(list, 0, firstHalf, 0, firstHalf.length);
			
			System.arraycopy(list, firstHalf.length, secondHalf,0 , secondHalf.length);
			mergeSort(firstHalf);
			mergeSort(secondHalf);
			merge0(firstHalf, secondHalf, list);
		}
    }
    static void merge0(farmer[] f, farmer[] s , farmer[] source ) {
		int c1 = 0,c2=0,c3=0;
		while(c1 < f.length && c2 < s.length) {
			if (f[c1].start < s[c2].start) {
				source[c3] = f[c1];	
				c1++;
			} else {
				source[c3] = s[c2];
				c2++;
			}
			c3++;
		}
		while (c1 < f.length) {
			source[c3] = f[c1];
			c1++;
			c3++;
		}
		while (c2 < s.length) {
			source[c3] = s[c2];
			c2++;
			c3++;
		}
	}
}
class farmer{
    public int start = 0;
    public int end = 0;
    public farmer(int start, int end){
        this.start = start;
        this.end = end;
    }
}