43. Multiply Strings
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public class Solution { public String multiply(String num1, String num2) { int[] product = new int[num1.length() + num2.length()]; for(int i = num1.length() - 1; i >= 0; i--){ for(int j = num2.length() - 1; j >= 0; j-- ){ int index = num1.length() + num2.length() - i - j - 2; product[index] += (num1.charAt(i) - '0') * (num2.charAt(j) - '0'); product[index + 1] += product[index] / 10; product[index] %= 10; } } StringBuilder sb = new StringBuilder(); for(int i = product.length - 1; i > 0; i--){ if(sb.length() == 0 && product[i] == 0) continue; sb.append(product[i]); } sb.append(product[0]); return sb.toString(); }}计算位置阅读全文
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