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main.go
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main.go
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package main
import (
"fmt"
"strings"
)
/*
给定两个以字符串形式表示的非负整数 num1 和 num2,返回 num1 和 num2 的乘积,
它们的乘积也表示为字符串形式。
输入: num1 = "123", num2 = "456"
输出: "56088"
*/
func main() {
num1 := "213123213"
num2 := "151231231231"
target := multiply(num1, num2)
fmt.Println(target)
}
func multiply(num1 string, num2 string) string {
if num1 == "0" || num2 == "0" {
return "0"
}
len1 := len(num1)
len2 := len(num2)
num := make([]byte, len1+len2)
var numR []byte
for i := len1 - 1; i >= 0; i-- {
t := num1[i] - '0'
for j := len2 - 1; j >= 0; j-- {
sum := t * (num2[j] - '0')
num[i+j+1] += sum % 10
num[i+j] += (num[i+j+1]/10 + sum/10)
num[i+j+1] %= 10
}
}
for i := 0; i < len1+len2; i++ {
numR = append(numR, num[i]+'0')
}
retStr := string(numR)
return strings.TrimLeft(retStr, "0")
}