ABC169 - Atcoder/Python精進のための解説メモ

a, b = map(int, input().split())
print(a * b)

n = int(input())
aaa = sorted(map(int, input().split()))
ans = 1
limit = 10 ** 18
for a in aaa:
    ans *= a
    if ans > limit:
        ans = -1
        break
print(ans)

from decimal import Decimal, ROUND_DOWN
  a, b = map(lambda x: Decimal(x), input().split())
  print(Decimal(a * b).quantize(Decimal('1.'), rounding=ROUND_DOWN))

from decimal import Decimal
a, b = map(str, input().split())
num = list(str(Decimal(a) * Decimal(b)))
ans = ''
for i in num:
    if i == '.':
        break
    ans += i
print(ans)

s = input().split()
a = int(s[0])
b, c = map(int, s[1].split('.')) if '.' in s[1] else map(int, [s[1], 0])
print(a * b + a * c // 100)

まだ解いてません