【Python】AtCoderのA問題を３０問だけ解く（for Python初心者）

速度に拘ったプログラミングが出来るよう、今月末までにA, B, C問題それぞれ30問ずつ解く。
A問題は組み込み関数を知ってるだけで解けてしまうので、難易度的には低いと思います。
とはいえ、基礎を確実に抑えているか否かによって、成長速度は変わってくると感じているので、焦らず解く。

ここでは、問題の詳細は述べず、単にプログラムを張るに留める。

注釈

入力の受付にinput().split(" ")と書いているが、input().split()でもイケます。（後半で気がついた。）

A - Weather Prediction

S = input()

clouds = ["Sunny", "Cloudy", "Rainy"]

if S == "Sunny":
    print("Cloudy")
elif S == "Cloudy":
    print("Rainy")
else:
    print("Sunny")

A - Password

N = int(input())
c = N ** 3
print(c)

A - Tenki

S = list(input())
T = list(input())

i = 0
ans_cnt = 0

while i < len(S):
    if S[i] == T[i]:
        ans_cnt += 1
    i += 1

print(ans_cnt)

A. Red or Not

a = int(input())
s = input()

if a >= 3200:
    print(s)
else:
    print("red")

A. +-x

A, B = list(map(int, input().split(" ")))

result = [A + B, A - B, A * B]
result.sort(reverse=True)
print(result[0])

A. Transfer

A, B, C = map(int, input().split(" "))

if B + C <= A:
    print(0)
else:
    print(C - (A - B))

A - Dodecagon

r = int(input())
print(3 * r ** 2)

A. T or T

N, A, B = map(int, input().split(" "))
print(min(A * N, B))

A. Fifty-Fifty

S = list(input())
S_set = set(S)

for target in S_set:
    if S.count(target) != 2:
        print("No")
        exit()

print("Yes")

A. Security

S = list(input())
i = 0
while i < len(S) - 1:
    if S[i] == S[i+1]:
        print("Bad")
        exit()
    i += 1
print("Good")

A - Rounding

X, A = input().split(" ")

if X < A:
    print(0)
else:
    print(10)

A - Airplane

flight_times = list(map(int, input().split(" ")))
flight_times.sort()
print(flight_times[0] + flight_times[1])

A - Apple Pie

A, P = map(int, input().split(" "))
print(int((A*3+P) / 2))

A - Ferris Wheel

A, B = list(map(int, input().split(" ")))
if A >= 13:
    print(B)
elif 6 <= A <= B:
    print(int(B/2))
else:
    print(0)

A - Changing a Character

N, K = list(map(int, input().split()))
S = list(input())
S[K-1] = S[K-1].lower()
print("".join(S))

A - Biscuit Generator

A, B, T = map(int, input().split())

cnt = T//A
print(cnt * B)

A. Buttons

A, B = map(int, input().split())
print(max(2*A-1, 2*B-1, A+B))

A - Five Antennas

import itertools

plots = [int(input()) for _ in range(5)]
k = int(input())

combs = itertools.combinations(plots, 2)
for comb in combs:
    if abs(comb[0]-comb[1]) > k:
        print(":(")
        exit()

print("Yay!")

A - Double Helix

base = {"A": "T", "C": "G", "G": "C", "T": "A"}
print(base[input()])

A - White Cells

H, W = map(int, input().split())
h, w = map(int, input().split())

whole = H*W
points_row = h * W
points_column = w * H
duplicates = h * w

print(whole - (points_row + points_column - duplicates))

A - Favorite Sound

A, B, C = map(int, input().split())

if B // A < C:
    print(B // A)
else:
    print(C)

A - Still TBD

from datetime import datetime

S = datetime.strptime(input(), "%Y/%m/%d")
target = datetime(2019, 4, 30)

if S <= target:
    print("Heisei")
else:
    print("TBD")

A - B +/- A

A, B = map(int, input().split())

if B % A == 0:
    print(A + B)
else:
    print(B - A)

A - Entrance Examination

T, X = map(int, input().split())
print(T/X)

A - Right Triangle

AB, BC, CA = map(int, input().split())
print(int(AB * BC / 2))

A - Christmas Eve Eve Eve

days = {"22": "Christmas Eve Eve Eve", "23": "Christmas Eve Eve", "24": "Christmas Eve", "25": "Christmas"}
print(days[input()])

A - 753

accepted = [3, 5, 7]
x = int(input())

if x in accepted:
    print("YES")
else:
    print("NO")

A - Discount Fare

X, Y = map(int, input().split())
print(int(X + Y/2))

A - Programming Education

N = int(input())
if N == 1:
    print("Hello World")
else:
    A, B = [int(input()) for _ in range(2)]
    print(A + B)

A - AtCoder Beginner Contest 999

n = list(input())
result = ""

for num in n:
    if num == "1":
        result += "9"
    else:
        result += "1"

print(result)

A - Maximize the Formula

choices = list(map(int, input().split()))
choices.sort(reverse=True)
print(int(str(choices[0]) + str(choices[1])) + choices[2])

愚直に解くならこう

from itertools import permutations
from copy import copy

choices = list(map(int, input().split()))
combs = permutations(choices, 2)

res = 0

for comb in combs:
    left = copy(choices)
    for num in comb:
        left.remove(num)
    right = int(str(comb[0]) + str(comb[1]))
    total = left[0] + right
    if total > res:
        res = total

print(res)

最後に

最後まで閲覧いただきありがとうございます。
できるだけ短く、簡潔なコードを書いたつもりですが、アドバイス等頂けますと幸いです・・・！
明日はB問題解くよ！