luogu P1304 哥德巴赫猜想

（N为偶数）。

输入输出格式

4=2+2 6=3+3 …… N=x+y

输入输出样例

`10`

```4=2+2
6=3+3
8=3+5
10=3+7枚举```
```#include<cstdio>
#include<cmath>
using namespace std;
int n;
bool a[10006];
int num_prime=0, prime[10006];
void init()
{
scanf("%d",&n);
a[0]=a[1]=1;
for(int i=2;i<=n;i++)
{
if(!a[i])
prime[num_prime++]=i;
for(int j=0;j<num_prime&&i*prime[j]<=n;j++)
{
a[i*prime[j]]=1;
if(!(i%prime[j]))
break;
}
}
}
void solve(int x)
{
int i=0;
while(prime[i]<x)
{
int tmp=x-prime[i];
if(!a[tmp])
{
printf("%d=%d+%d\n",x,prime[i],tmp);
return;
}
i++;
}
}
int main()
{
init();
for(int i=4;i<=n;i+=2)
{
solve(i);
}
return 0;
}```

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1 #include <stdio.h> 2 #include <stdlib.h> 3 #include <math.h> 4 5 int isit(int num) 6 { 7 int i; 8 int flag = 1;//表述为素数 9 if(num==2) 10 { 11 return 1; 12 }else if(num==3) 13 { 14 return 1; 15 }else if(num<=1) 16 { 17 return 0; 18 }el

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1 #include<iostream> 2 #include<cmath> 3 using namespace std; 4 bool isPrime(long n){ 5 int i; 6 for(i=2;i<=sqrt(n);++i) 7 if(n%i==0) 8 break; 9 if(n>1&&i>sqrt(n)) 10 return true; 11 else 12 return false; 13 } 14 int main(){ 1

C#实现哥德巴赫猜想

using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace GoetheOfArithmetic { class Program { static void Main(string[] args) { Console.WriteLine("请输入一个大于6的偶数:"); int intNum = Convert.ToInt32(Console.ReadLi