A计划--POJ1007 DNA Sorting

Posted 2022-12-07 光光-Leo

A题不分早晚！

思路是首先把每行的DNA串使用归并排序计算出逆序数对的个数，然后在对每组产生的逆序数对数对原始数据进行排序

import java.util.Scanner;

public class Main
	static String dnas[];
	static String dataStr[];
	static int data[];
	static int step;
	static int steps[];
	static int number = 0;
	static String tempStr[];

	public static void sort(int left,int right,int temp[])
		if(left<right)
			int mid = (left+right)/2;
		    sort(left,mid,temp);
		    sort(mid+1,right,temp);
		    merge(left,mid,right,temp);
		
	
	public static void merge(int left,int mid,int right,int temp[])
		int i = left;
		int j = mid+1;
		int t = 0;
		while(i<=mid&&j<=right)
			if(data[i]<=data[j])
				temp[t++] = data[i++];
			else
				temp[t++] = data[j++];
				step+=mid-i+1;
			
		
		while(i<=mid)
			temp[t++] = data[i++];
		
		while(j<=right)
			temp[t++] = data[j++];
		
		t = 0;
		while(left<=right)
			data[left++] = temp[t++];
		
	
	public static void sort2(int left,int right,int temp[])
		if(left<right)
			int mid = (left+right)>>1;
			sort2(left,mid,temp);
			sort2(mid+1,right,temp);
			merge2(left,mid,right,temp);
		
	
	public static void merge2(int left,int mid,int right,int temp[])
		int i = left;
		int j = mid+1;
		int t = 0;
		while(i<=mid&&j<=right)
			if(steps[i]<=steps[j])
				temp[t] = steps[i];
				tempStr[t] = dnas[i];
				t++;
				i++;
			else
				temp[t] = steps[j];
				tempStr[t] = dnas[j];
				t++;
				j++;
			
		
		while(i<=mid)
			temp[t] = steps[i];
			tempStr[t] = dnas[i];
			t++;
			i++;
		
		while(j<=right)
			temp[t] = steps[j];
			tempStr[t] = dnas[j];
			t++;
			j++;
		
		t = 0;
		while(left<=right)
			steps[left] = temp[t] ;
			dnas[left]= tempStr[t] ;
			left++;
			t++;
		
	
	public static void main(String[] args) 
		Scanner sc = new Scanner(System.in);
		int length = sc.nextInt();
		int num = sc.nextInt();
		dnas = new String[num];
		steps = new int[num];
		sc.nextLine();
		while(number<num)
			String dna = sc.next();
			dnas[number] = dna;
			dataStr = new String[length];
			dataStr = dna.split("");
			int temp[] = new int[dataStr.length-1];
			data = new int[dataStr.length-1];
			for(int j=0;j<data.length;j++)
				if("A".equals(dataStr[j+1]))
					data[j] = 1;
				else if("G".equals(dataStr[j+1]))
					data[j] = 3;
				else if("C".equals(dataStr[j+1]))
					data[j] = 2;
				else if("T".equals(dataStr[j+1]))
					data[j] = 4;
				
			
			step = 0;
			Main.sort(0, data.length-1, temp);
			steps[number] = step;
			sc.nextLine();
			number++;
		
	    int temp[] = new int[steps.length];
	    tempStr = new String[steps.length];
		Main.sort2( 0, steps.length-1,temp);
		for(String s:dnas)
			System.out.println(s);