adventofcode2022/day07/sol.awk

# run me with awk -f sol.awk < input

BEGIN { depth = 0 }

/^\$/ { cmd = $2 }

/^\$ cd \/$/    { depth = 0; next }
/^\$ cd \.\.$/  { depth -= 1; next }
/^\$ cd/        { cwd[depth++] = $3; next }
/^\$ ls$/       { next }

function add(sz) {
    sizes["/"] += sz
    path = ""
    for (i = 0; i < depth; i++) {
        path = path "/" cwd[i]
        sizes[path] += sz
    }
}

cmd == "ls" && $1 != "dir" {
    #print(dir "/" $2, $1)
    add($1)
}

END {
    print sizes["/"]
    # for (i in sizes) { print i, sizes[i] }

    t1 = 0
    for (i in sizes) {
        if (sizes[i] <= 100000) {
            t1 += sizes[i]
        }
    }
    print t1

    t2 = 0
    for (i in sizes) {
        if (70000000 - sizes["/"] + sizes[i] >= 30000000) {
            if (sizes[i] < t2 || t2 == 0)
                t2 = sizes[i]
        }
    }
    print t2
}