[至急]Project Euler:#21Amicable numbersコード、入力、出力、解説

https://projecteuler.net/problem=21

Let d(n) be defined as the sum of proper divisors of n (numbers less than n which divide evenly into n).
If d(a) = b and d(b) = a, where a ≠ b, then a and b are an amicable pair and each of a and b are called amicable numbers.

For example, the proper divisors of 220 are 1, 2, 4, 5, 10, 11, 20, 22, 44, 55 and 110; therefore d(220) = 284. The proper divisors of 284 are 1, 2, 4, 71 and 142; so d(284) = 220.

Evaluate the sum of all the amicable numbers under 10000.

私の考え
for 1≦a≦n
□□b ← d(i)
□□if d(b) = i
□□□□sum ← sum + a + b

No.1 ベストアンサー 回答者： cametan_42 回答日時： 2022/09/25 23:25

実装例:

https://www.ideone.com/RMA2Hw