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whatalnk/agc031-a.rb

Created April 18, 2019 03:17
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AtCoder AGC #031 A - Colorful Subsequence
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agc031-a.rb
n = gets.chomp.to_i
s = gets.chomp
h = Hash.new(0)
n.times do |i|
h[s[i]] += 1
end
MOD = 10**9 + 7
ans = 1
h.each do |k, v|
ans *= (v + 1)
ans %= MOD
end
puts ans - 1
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