* Plus Minus
import Foundation

// number of elements
let n = Int(readLine()!)!

// read array and map the elements to integer
let arr = readLine()!.components(separatedBy: " ").map{ Int($0)! }

var posi = 0
var nega = 0
var zero = 0

for i in 0..<n {
    if arr[i] > 0 {posi += 1}
    else if arr[i] == 0 {zero += 1}
    else {nega += 1}
}

let posifraction = Double(posi)/Double(n)
let negafraction = Double(nega)/Double(n)
let zerofraction = Double(zero)/Double(n)
//자리수 지정 어떻게하나

print((posifraction)E-5)
print((negafraction)E-5)
print((zerofraction)E-5)

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* Staircase
import Foundation

// read the integer n
let n = Int(readLine()!)!

// print the staircase

for i in 1...n{
    if i==n{print("",terminator:"")}
    else {for j in 1...n-i {print(" ",terminator:"")}}
    for j in 1...i {print("#",terminator:"")}
    print()
}

---