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求助:为什么老是runtime error呀#include <iostream.h>
bool show[50001];
void main()
{
int n;
int b;
while(1)
{
cin>>n;
if(n==-1)
break;
if(n==0)
{ cout<<"0\n";
continue;
}
if(n==1)
{ cout<<"1\n";
continue;
}
if(n==2)
{ cout<<"3\n";
continue;
}
for(int j=0;j<50001;j++)
show[j]=false;
show[0]=true;
show[1]=true;
show[3]=true;
b=3;
for(int i=3;i<=n;i++)
{
if(show[b-i]==false&&b-i>0)
{
b=b-i;
show[b]=true;
}
else
{
b=b+i;
show[b]=true;
}
}
cout<<b<<endl;
}
}
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