ABC083B - Some Sums

問題

https://atcoder.jp/contests/abs/tasks/abc083_b

1回目

回答

N,A,B = gets.chomp.split(" ").map(&:to_i)

res = 0
for num in 1..N do
  numList = num.to_s.chars.map(&:to_i)
  sum = 0
  for n in numList do
    sum += n
  end
  if sum >= A && sum <= B
    res += num
  end
end

puts res

結果

2回目

回答

N,A,B = gets.chomp.split(" ").map(&:to_i)

res = 0

for num in 1..N do
  s = 0
  n = num
  while n > 0 do
    s += n % 10
    n /= 10
  end
  if s >= A && s <= B
    res += num
  end
end

puts res

結果