A： Codeforces 1006A. Adjacent Replacements(水题)

B：Codeforces 1006B. Polycarp's Practice(思维)

C：Codeforces 1006C.Three Parts of the Array(模拟)

D：Codeforces 1006D. Two Strings Swaps(思维)

F：Codeforces 1006F. Xor-Paths (双向搜索)