蓝桥杯 历届试题 约数倍数选卡片 求大神指点 首先声明，我的代码有问题！不喜勿进，若有意向，可以讨论，我百度不到这道题的题解

#include <cstdio>
#include <cstring>
#include <algorithm>
#define MAX 110
using namespace std ;
int sg[MAX] ;
int num1[200] , num2[200] ;
bool graph[MAX][MAX],visited[MAX] ;
int get(char ch[] , int num[])
{
	gets(ch);
	int len = strlen(ch) , index = 1;
	for(int i = 0 ; i < len ; ++i)
	{
		if(ch[i] == ' ')
		{
			++index ;
		}
		else
		{
			num[index] = num[index]*10+ch[i]-'0' ;
		}
	}
	return index+1 ;
}
int len1 , len2 ;
int getSG(int index)
{
	bool hash[MAX] , flag = false;
	memset(hash,false,sizeof(hash));
	for(int i = 0 ; i < len1 ; ++i)
	{
		if(!visited[i] && graph[index][i])
		{
			flag = true;
			visited[i] = true ;
			hash[getSG(i)] = true ;
			visited[i] = false ;
		}
	}
	for(int i = 0 ; i < MAX ; ++i)
	{
		if(!hash[i])
		{
			//if(sg[index] == 0)
			return sg[index]=i ;
		}
	}
}

int Bsearch(int x)
{
	int i = 1 , j = len1-1 ;
	while(i<=j)
	{
		int mid = (i+j)>>1 ;
		if(num1[mid]>x)
		{
			j = mid-1 ;
		}
		else if(num1[mid]<x)
		{
			i = mid+1 ;
		}
		else
		{
			return mid ;
		}
	}
	return i ;
}

bool cmp(const int a , const int b)
{
	return a<b ;
}
int main()
{
	char line1[200],line2[200];
	len1 = get(line1 , num1) ;
	len2 = get(line2 , num2) ;
	sort(num1+1,num1+len1,cmp);
	sort(num2+1,num2+len2,cmp);
	for(int i = 1 ; i < len1 ; ++i)
	{
		for(int j = 1 ; j < i ; ++j)
		{
			if(num1[i]%num1[j] == 0 || num1[j]%num1[i]==0)
			{
				graph[i][j] = graph[j][i] = true ;	
			}
		}
	}
	for(int i = 1 ; i < len2 ; ++i)
	{
		int x = Bsearch(num2[i]) , j = x;
		while(num1[--j] == num2[i])
		{
			graph[0][j] = true ;
		}
		j = x ;
		while(num1[j++] == num2[i])
		{
			graph[0][j] = true;
		}
	}
	memset(sg,-1,sizeof(sg)) ;
	visited[0] = true ;
	getSG(0) ;
	if(sg[0] == 0)
	{
		puts("-1") ;
	}
	else
	{
		for(int i = 1 ; i < len2 ; ++i)
		{
			int x = Bsearch(num2[i]) ;
			if(sg[x]==0)
			{
				printf("%d\n",num2[i]) ;
				break ;
			}
		}
	}
	
	return 0 ;
}