AtCoder Beginner Contest 097

Colorful-Transceivers.py

a, b, c, d = map(int, input().split())

if abs(a - c) <= d or abs(a - b) <= d and abs(b - c) <= d:
    print("Yes")
else:
    print("No")

Exponential.py

X = int(input())

perfectNumbers = set([1])

for i in range(2, 33):
    j = 2
    while True:
        perfectNumbers.add(i**j)
        j += 1
        if (i**j > 1000):
            break

ans = 0
for i in sorted(perfectNumbers):
    if i > X:
        break
    ans = i

print(ans)

K-th-Substring.py

import re
s = input()
K = int(input())

chars = [
    'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
    'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'
]

current = ""

for i in range(K):
    if current == "":
        current = min(s)
        continue

    startIndexes = [m.start() for m in re.finditer(current, s)]
    candidates = [s[index:index + len(current) + 1] for index in startIndexes]
    for candidate in candidates:
        if candidate == current:
            candidates.remove(candidate)
    if not candidates:
        current = min(s.replace(current[0], ""))
    else:
        current = min(candidates)

print(current)