balls4.std

本光盘是《国际大学生程序设计竞赛例题解（一）》的配套光盘

0 bbbb  aaaa
1 bbbbaa  aa
2   bbaabbaa
3 aabbaabb  
4 aa  aabbbb

0 bbaa  abab
1 bbaabaa  b
2   aabaabbb
3 aaaab  bbb

0 ba  bababa
1 baabbab  a
2   abbabbaa
3 aaabbabb  
4 aaa  abbbb

0 ab  abbaab
1 abaaabb  b
2 abaaa  bbb
3   aaaabbbb