UVA 384 Slurpys 状态机实现
从隔壁大佬学来的思路，或许这样会更清晰一点……仅供参考。
#include
#include
using namespace std;
int main()
{
char str[100000];
int n;
enum states {next_slimps,closing_slimps,next_slumps,new_slumps,f_ing,end_slumps,error};
while(scanf("%d",&n)!=EOF)
{
printf("SLURPYS OUTPUT\n");
while(n--)
{
cin>>str;
int i=0,opened=0,closed=0,finish_slimps=0;
char c=str[i];
states state=next_slimps;
while(c!='\0')
{
switch (state)
{
case next_slimps:
{
if(c=='A')
{
state=next_slumps;
opened++;
break;
}
else
{
state=error;
break;
}
}
case closing_slimps:
{
if(opened!=closed)
{
if(c=='C')
{
closed++;
break;
}
else
{
state=error;
break;
}
}
else
{
state=next_slumps;
finish_slimps=1;
i--;
break;
}
}
case next_slumps:
{
if(c=='D'||c=='E')
{
state=new_slumps;
break;
}
else if(c=='B')
{
state=next_slimps;
break;
}
else if(c=='H')
{
state=closing_slimps;
closed++;
break;
}
else
{
state=error;
break;
}
}
case f_ing:
{
if(c=='F')
{
break;
}
else if(c=='D'||c=='E')
{
state=new_slumps;
break;
}
else if(c=='G')
{
state=end_slumps;
break;
}
else
{
state=error;
break;
}
}
case new_slumps:
{
if(c=='F')
{
state=f_ing;
break;
}
else
{
state=error;
break;
}
}
case end_slumps:
{
if(!finish_slimps)
{
closed++;
state=closing_slimps;
break;
}
else
{
state=error;
break;
}
}
}
c=str[++i];
if(state==error)
{
goto print;
}
}
print:
if(state==end_slumps)
{
printf("YES\n");
}
else
{
printf("NO\n");
}
}
printf("END OF OUTPUT\n");
}
return 0;
}