Leetcode 43. Multiply Strings
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public class Solution { public String multiply(String num1, String num2) { int m = num1.length(), n = num2.length(); int[] pos = new int[m + n]; for(int i = m - 1; i >= 0; i--) { for(int j = n - 1; j >= 0; j--) { int mul = (num1.charAt(i) - '0') * (num2.charAt(j) - '0'); int p1 = i + j, p2 = i + j + 1; int sum = mul + pos[p2]; pos[p1] += sum / 10; pos[p2] = (sum) % 10; } } StringBuilder sb = new StringBuilder(); for(int p : pos) sb.append(p); return sb.length() == 0 ? "0" : sb.toString(); }}
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