AtCoder Problems の Boot camp for Beginners を埋めていく

AtCoder ProblemsのBoot camp for Beginnersに掲載されている問題を埋めていきたいと思います。言語は基本的にC++(g++)です。自分の復習用に記録していきますが，公開しておけば詳しい方からアドバイスがもらえたりするかもしれないと思って。

AtCoder Problemsのdifficulty基準で，下に行くほど難易度が上がる（傾向がある）ようです。

Easy 100

#1 B. Power Socket
#2 C. Rally
#3 B. Qualification simulator
#4 B. Tax Rate
#5 B. Can you solve this?
#6 B. Bishop
#7 B. Bingo
#8 B. 1 21
#9 B. Collecting Balls (Easy Version)
#10 B. Card Game for Two
#11 B. Break Number
#12 C. Travelling Salesman around Lake★
#13 A. Cookie Exchanges
#14 C. Replacing Integer★
#15 C. Divide the Problems
#16 C. Go to School★
#17 C. Alchemist
#18 B. ATCoder
#19 B. Toll Gates
#20 B. Collatz Problem★
#21 C. Next Prime
#22 A. Candy Distribution Again
#23 B. Chocolate
#24 B. Nice Shopping
#25 C. Count Order
#26 D. Caracal vs Monster
#27 B. Count Balls
#28 B. Shift Only
#29 B. 754
#30 B. Ruined Square
#31 B. Varied
#32 B. Increment Decrement
#33 B. Postal Code
#34 B. Coins
#35 B. Not Found
#36 C. Prison
#37 C. Attack Survival
#38 B. Five Dishes
#39 C. Exception Handling
#40 A. Range Product
#41 C. Low Elements
#42 B. Foods Loved by Everyone
#43 B. 美しい文字列
#44 C. Coloring Colorfully
#45 B. Palindromic Numbers
#46 A. Fairness
#47 B. Lucas Number
#48 C. Lower
#49 B. Picture Frame
#50 B. Comparison
#51 B. Some Sums
#52 C. Maximal Value
#53 B. Counting Roads
#54 B. Shiritori
#55 B. Good Distance
#56 B. Small and Large Integers
#57 C. Tax Increase
#58 B. Palace
#59 B. AcCepted
#60 B. Contest with Drinks Easy
#61 B. String Rotation
#62 B. たてなが
#63 D. Brick Break
#64 B. ∵∴∵
#65 B. A to Z String
#66 A. Wanna go back home
#67 C. Poll
#68 B. Guidebook
#69 A. Dividing a String
#70 C. 100 to 105
#71 B. 文字列大好きいろはちゃんイージー
#72 B. Exponential
#73 A. Digit Sum 2
#74 C. Half and Half
#75 C. Christmas Eve
#76 C. Welcome to AtCoder
#77 A. AtCoder Group Contest
#78 C. Build Stairs
#79 A. Table Tennis Training
#80 C. Walk on Multiplication Table
#81 C. *3 or /2
#82 A. Ice Tea Store
#83 C. Candies

Medium 100

#1 B. Trained?
#2 A. Irreversible operation
#3 A. ><
#4 B. ss
#5 D. ModSum
#6 B. Minesweeper