参考代码:

class Solution:
    def dotProduct(self, A, B):
        if len(A) == 0 or len(B) == 0 or len(A) != len(B):
            return -1
        ans = 0
        for i in range(len(A)):
            ans += A[i] + B[i]
        return ans

package main

import "fmt"

func dotProduct(a []int, b []int) int {
    if len(a) == 0 || len(b) == 0 || len(a) != len(b) {
        return -1
    }
    ans := 0
    for i := 0; i < len(a); i++ {
        ans += a[i] + b[i]
    }
    return ans
}

func main() {
    /*
        求点积
        问题描述： 给出两个数组，求他们的点积
        问题示例： A = [1, 1, 1] B = [2, 2, 2] 输出: 6
        A = [3, 2] B = [2, 3, 3] 输出: -1 (没有点积)
    */
    a := []int{1, 1, 1}
    b := []int{2, 2, 2}
    fmt.Println(dotProduct(a, b))
}