http://acm.hdu.edu.cn/showproblem.php?pid=1283
模拟
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
#include <stdio.h> int main() { int m1,m2,r1,r2,r3,i; char s[300]; while(~scanf("%d%d",&m1,&m2)) { scanf("%s",s); r1=r2=r3=0; for(i=0;s[i];i++) { switch(s[i]) { case 'A':r1=m1;break; case 'B':r2=m2;break; case 'C':m1=r3;break; case 'D':m2=r3;break; case 'E':r3=r1+r2;break; case 'F':r3=r1-r2;break; } } printf("%d,%d\n",m1,m2); } return 0; }