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"1" : "0" + ϵ *= count(==("1"), n) > count(==("0"), n) ? "0" : "1" + end + parse(Int, γ; base=2) * parse(Int, ϵ; base=2) +end + + +function p2(input::Vector{String}) + i1 = deepcopy(input) + i2 = deepcopy(input) + ox = "" + co = "" + for i in 1:length(input[1]) + oxbits = map(x -> x[i], i1) + oxmc = count(==('1'), oxbits) >= count(==('0'), oxbits) ? '1' : '0' + filter!(x -> x[i] == oxmc, i1) + + cobits = map(x -> x[i], i2) + comc = count(==('1'), cobits) >= count(==('0'), cobits) ? '0' : '1' + filter!(x -> x[i] == comc, i2) + + if length(i1) == 1 && ox == "" + ox = i1[begin] + end + + if length(i2) == 1 && co == "" + co = i2[begin] + end + end + parse(Int, ox; base=2) * parse(Int, co; base=2) +end + +@aoc(2021, 3)