RT debug了3h……

如果你用的是getchar做这道题：

1. 一定要判EOF！

2. Windows系统就算在IDE下跑换行符也会变成\r\n，建议：

int cur=0;
char impur[10005]="\nA came!\na started playing games!\nb started playing games!\nA left!\nc started playing games!\nd started playing games!\ne started playing games!\nB came!\nPS:zhe_ge_yang_li_hen_zheng_chang!\nB left!\n";
inline int gc()
{
    return impur[cur++];
} 
#define getchar gc

调试。