解题的思路并不复杂:模拟算数的乘法运算过程
但是一次直接AC还是比较困难的。
注意点:
1.进位 每一轮的进位最终存在的话,还需要加上
2.高位和低位的存储问题
3.输入,输出问题
输出ACM,采用System,out.println();
import java.io.*;import java.util.*;public class Main{public static String mul(String s1, String s2){int[] i1 = new int[s1.length()];int[] i2 = new int[s2.length()];int[] res = new int[s1.length() + s2.length()];for (int i = 0; i < s1.length(); i++)i1[i] = s1.charAt(i) - '0';for (int i = 0;i < s2.length() ;i++)i2[i] = s2.charAt(i) - '0';int ji = 0;int k = i2.length;int i = 0, j = 0;for (i = i2.length - 1;i >= 0 ; i--){for(j = i1.length - 1; j >= 0; j--){res[k + j] += (i2[i]* i1[j]) % 10 + ji;ji = (i2[i]* i1[j]) / 10;if (res[k + j] >= 10){res[k + j - 1] += res[k + j] / 10;res[k + j] = res[k + j] % 10;}}if (ji > 0) res[k + j] += ji;ji = 0;k --;}boolean b = false;String sr = "";for (i = 0; i < res.length; i ++)if (b)sr += String.valueOf(res[i]);elseif (res[i] != 0){b = true;sr += String.valueOf(res[i]);}return sr;}public static void main(String args[]) throws IOException{BufferedReader br = new BufferedReader(new InputStreamReader(System.in));String[] input = br.readLine().split(" ");String res = mul(input[0], input[1]);System.out.println(res);}}
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