练习 2.8 2月8日内部练习 说明 一共15题，挑选其中7题做，期间可看题解，晚上10点考试。 将提交记录截图发群。 test 1 1996A-Leg test 2 1992A-Only Pluses test 3 1913A-Rating Increase test 4 1909A-Distinct Buttons test 5 1896A-Jagged Swaps test 6 1883B-Chemistry test 7 1876A-Helmets in Night Light test 8 1850A-To My Critics test 9 1850B-Ten words of wisdom test 10 1850C-Word on the Paper test 11 1850D-Balanced Round test 12 1791A-Codeforces Checking test 13 1791B-Following Directions test 14 1791C-Prepend and Append test 15 282A-Bit++ test 16 按钮