Codeforces Round 89 (Rated for Div. 2)-白红宇

Codeforces Round 89 (Rated for Div. 2)

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发布时间：2019-03-04

本文共 569 字，大约阅读时间需要 1 分钟。

A. Shovels and Swords

?????????x???????y???????????????????

0 ? 2x + y ? a

0 ? x + 2y ? b

?????(x + y)???????????????????????????????x?y????????????????????x?y?????x + y???

B. Shuffle

???????????????????????????????????????????

??????L????R???????????

??????????????L?R?

????????????R - L + 1?

C. Palindromic Paths

????(1,1)?(n,m)????????????????????????????????????????

D. Two Divisors

??????????1??????????????????1?????????????????????????????????????????????????????????

???

A. ???? (a + b - |a - b|) / 2

B. ????? R - L + 1

C. ???????????????????

D. ???????????????

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