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原来auto有毒！原先程序：
#include<iostream>
#include<cstdio>
#include<vector>
#include<cmath>
#include<algorithm>
#include<string>
#include<set>
#include<map>
#include<ctime>
#include<cstring>
#include<cassert>
#include<bitset>
#include<sstream>
#include<queue>
using namespace std;
int prime[10100],d[10100];
vector<int>a[10100],primes;
int isValid(int x,int y)
{
int dif=0;
for(int i=0;i<4;i++)
{
dif+=(x%10!=y%10);
x/=10;
y/=10;
}
return dif==1;
}
int main()
{
ios::sync_with_stdio(0);
for(int i=1000;i<10000;i++)
{
prime[i]=1;
for(int j=2;j*j<=i;j++)
{
if(i%j==0)
{
prime[i]=0;
break;
}
}
if(prime[i]) primes.push_back(i);
}
int x,y;
for(auto x: primes)
{
for(auto y : primes)
{
if(isValid(x,y))
a[x].push_back(y);
}
}
int times;
cin>>times;
while(times--)
{
int from,to;
cin>>from>>to;
memset(d,-1,sizeof d);
queue<int> q;
d[from]=0;
q.push(from);
while(!q.empty() && d[to]<0)
{
int x=q.front();
q.pop();
for(auto y :a[x])
{
if(d[y]<0)
{
d[y]=d[x]+1;
q.push(y);
}
}
}
cout<<d[to]<<endl;
}
return 0;
}
苦思半天，找错后：
#include<iostream>
#include<cstdio>
#include<vector>
#include<cmath>
#include<algorithm>
#include<string>
#include<set>
#include<map>
#include<ctime>
#include<cstring>
#include<cassert>
#include<bitset>
#include<sstream>
#include<queue>
using namespace std;
int prime[10100],d[10100];
vector<int>a[10100],primes;
int isValid(int x,int y)
{
int dif=0;
for(int i=0;i<4;i++)
{
dif+=(x%10!=y%10);
x/=10;
y/=10;
}
return dif==1;
}
int main()
{
for(int i=1000;i<10000;i++)
{
prime[i]=1;
for(int j=2;j*j<=i;j++)
{
if(i%j==0)
{
prime[i]=0;
break;
}
}
if(prime[i]) primes.push_back(i);
}
for(int i=0;i<primes.size();i++)
{
for(int j=0;j<primes.size();j++)
{
int x=primes[i];
int y=primes[j];
if(isValid(x,y))
a[x].push_back(y);
}
}
int times;
cin>>times;
while(times--)
{
int from,to;
cin>>from>>to;
memset(d,-1,sizeof d);
queue<int> q;
d[from]=0;
q.push(from);
while(!q.empty() && d[to]<0)
{
int x=q.front();
q.pop();
for(int i=0;i<a[x].size();i++)
{
int y=a[x][i];
if(d[y]<0)
{
d[y]=d[x]+1;
q.push(y);
}
}
}
cout<<d[to]<<endl;
}
return 0;
}
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