10494,没过,待解决,大数除法

import java.io.*;
import java.util.*;public class Main
{public static void main(String[] args) throws FileNotFoundException{// Scanner scanner = new Scanner(new File("d://1.txt"));Scanner scanner = new Scanner(System.in);while (scanner.hasNextLine()){String str1 = scanner.nextLine();String str2 = scanner.nextLine();System.out.println(sub(str1, str2));}scanner.close();}public static String sub(String str1, String str2){int minLength = -1;int maxLength = -1;if (str1.length() > str2.length()){minLength = str2.length();maxLength = str1.length();}else{minLength = str1.length();maxLength = str2.length();String temp = str1;str1 = str2;str2 = temp;}// 俩个数相减后剩下的最大长度char cc[] = new char[maxLength];// 大数减小数,好像负号和减法并没有关系int dx = 0;int cIndex = 0;int dl = maxLength - minLength;for (int i = minLength - 1; i >= 0; i--){int s = str1.charAt(i + dl) - str2.charAt(i) - dx;dx = 0;if (s < 0){dx = 1;s += 10;}cc[cIndex++] = (char) (s + '0');}for (int i = maxLength - cIndex-1; i >= 0; i--){int s = str1.charAt(i) - '0' - dx;dx = 0;if (s < 0){dx = 1;s += 10;}cc[cIndex++] = (char) (s + '0');}if(cc[cIndex - 1] == '0'){return "0";}StringBuilder sb = new StringBuilder();for (int i = cIndex - 1; i >= 0; i--){sb.append(cc[i]);}return sb.toString();}public static String mul(String str1, String str2){int minLength = -1;int maxLength = -1;if (str1.length() > str2.length()){minLength = str2.length();maxLength = str1.length();}else{minLength = str1.length();maxLength = str2.length();String temp = str1;str1 = str2;str2 = temp;}int[] cc = new int[maxLength + minLength];int maxIndex = -1;for (int i = minLength - 1; i >= 0; i--){char c2 = str2.charAt(i);int cIndex = minLength - 1 - i;int dx = 0;for (int j = maxLength - 1; j >= 0; j--){cc[cIndex] = (str1.charAt(j) - '0') * (c2 - '0') + dx+ cc[cIndex];dx = cc[cIndex] / 10;cc[cIndex] = cc[cIndex] % 10;cIndex++;}if (maxIndex < cIndex){maxIndex = cIndex;}cIndex = maxIndex;if (dx != 0){while (dx != 0){cc[cIndex] = cc[cIndex] + dx;dx = cc[cIndex] / 10;cc[cIndex] = cc[cIndex] % 10;cIndex++;}maxIndex = cIndex;}}StringBuilder sb = new StringBuilder();for (int i = maxIndex - 1; i >= 0; i--){if (cc[i] == 0 && i == maxIndex - 1){return "0";}sb.append((char) (cc[i] + '0'));}return sb.toString();}}