Question

我试图找到2个素数，这些素数总和到用户指定的某个整数N.但是我得到了MLE的这个错误

def is_prime(n):
    if n == 2:
        return True
    if n%2 == 0 or n <= 1:
        return False
    sqr = int(n**0.5) + 1
    for divisor in range(3, sqr, 2):
        if n%divisor == 0:
            return False
    return True

class Solution:
    # @param A : integer
    # @return a list of integers
    def primesum(self, A):
        #Creating the list of prime numbers
        h_prime ={}
        # Initializing the hash table
        # looking for the prime numbers
        for i in range (2, long (A)):
            if ( is_prime(i)):
                h_prime [i] = A-i;
        # Checking if the compliment is also a prime
        #We go through it element by element
        for key in h_prime:
            if key in h_prime and A-key in h_prime:
                my_list = [ key, A-key]
                return my_list

Answer 1

由于问题提示者似乎不想澄清，我会在Go中回答，因为我最近在练习它！

package main

import (
    "fmt"
    "math"
)

func isPrime(n int) bool {
    if n == 2 {
        return true
    } else if n%2 == 0 || n <= 1 {
        return false
    } else {
        sqrt := int(math.Floor(math.Sqrt(float64(n)))) + 1
        for divisor := 3; divisor < sqrt; divisor += 2 {
            if n%divisor == 0 {
                return false
            }
        }
        return true
    }

}

func PrimesSum(n int) (int, int, error) {
    primes := make(map[int]struct{})
    for i := 2; i <= n; i++ {
        if isPrime(i) {
            primes[i] = struct{}{}
        }
    }
    for primeOne, _ := range primes {
        primeTwo := n - primeOne
        _, ok := primes[primeTwo]
        if ok {
            return primeOne, primeTwo, nil
        }
    }
    return 0, 0, fmt.Errorf("No prime sum for %v", n)
}

func main() {
    var i int
    fmt.Println("Enter a number to check: ")
    fmt.Print(">> ")
    _, err := fmt.Scan(&i)
    if err == nil {
        primeOne, primeTwo, err := PrimesSum(i)
        if err == nil {
            fmt.Printf("%v, %v\n", primeOne, primeTwo)
        } else {
            fmt.Print(err)
        }
    } else {
        fmt.Printf("Invalid input, %v\n", err)
    }
}

为什么我的内存限制超出了？

1 个答案: