AGC007 A Shik and Stone 我是沙比这都能蛙一发 https://agc007.contest.atcoder.jp/submissions/7946110 B Construct Sequences 造两个等差数列\(20000,40000,\ldots,20000n\)和反过来作为基础\(A,B\),然后在上面减一下就好了. https://agc007.contest.atcoder.jp/submissions/7946428 C Pushing Balls 真tmd…