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yusuke024/aina.swift

Last active March 3, 2020 07:19
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aina.swift
#!/usr/bin/env swift
// swift aina.swift <n>
import Foundation
func p(_ n: Int) -> [String] {
if n == 0 { return ["A"] }
let p1 = [" A ", "A A", "AAA", "A A", "A A"]
var result: [String] = []
let prev = p(n-1) // Recursively get result of P(n-1).
for line in prev {
for p1l in p1 { // For each line in P(1)
var l = ""
for c in line { // Iterate each character in previous result
if c == " " { l += " " } // 3 spaces. Because P(1) is 3-space wide.
if c == "A" { l += p1l }
}
result.append(l)
}
}
return result
}
guard CommandLine.arguments.count == 2, let n = Int(CommandLine.arguments[1]) else {
fatalError("Need one argument (Int)")
}
print(p(n).joined(separator: "\n"))
@yusuke024
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P(3)

             A             
            A A            
            AAA            
            A A            
            A A            
          A     A          
         A A   A A         
         AAA   AAA         
         A A   A A         
         A A   A A         
          A  A  A          
         A AA AA A         
         AAAAAAAAA         
         A AA AA A         
         A AA AA A         
          A     A          
         A A   A A         
         AAA   AAA         
         A A   A A         
         A A   A A         
          A     A          
         A A   A A         
         AAA   AAA         
         A A   A A         
         A A   A A         
    A                 A    
   A A               A A   
   AAA               AAA   
   A A               A A   
   A A               A A   
 A     A           A     A 
A A   A A         A A   A A
AAA   AAA         AAA   AAA
A A   A A         A A   A A
A A   A A         A A   A A
 A  A  A           A  A  A 
A AA AA A         A AA AA A
AAAAAAAAA         AAAAAAAAA
A AA AA A         A AA AA A
A AA AA A         A AA AA A
 A     A           A     A 
A A   A A         A A   A A
AAA   AAA         AAA   AAA
A A   A A         A A   A A
A A   A A         A A   A A
 A     A           A     A 
A A   A A         A A   A A
AAA   AAA         AAA   AAA
A A   A A         A A   A A
A A   A A         A A   A A
    A        A        A    
   A A      A A      A A   
   AAA      AAA      AAA   
   A A      A A      A A   
   A A      A A      A A   
 A     A  A     A  A     A 
A A   A AA A   A AA A   A A
AAA   AAAAAA   AAAAAA   AAA
A A   A AA A   A AA A   A A
A A   A AA A   A AA A   A A
 A  A  A  A  A  A  A  A  A 
A AA AA AA AA AA AA AA AA A
AAAAAAAAAAAAAAAAAAAAAAAAAAA
A AA AA AA AA AA AA AA AA A
A AA AA AA AA AA AA AA AA A
 A     A  A     A  A     A 
A A   A AA A   A AA A   A A
AAA   AAAAAA   AAAAAA   AAA
A A   A AA A   A AA A   A A
A A   A AA A   A AA A   A A
 A     A  A     A  A     A 
A A   A AA A   A AA A   A A
AAA   AAAAAA   AAAAAA   AAA
A A   A AA A   A AA A   A A
A A   A AA A   A AA A   A A
    A                 A    
   A A               A A   
   AAA               AAA   
   A A               A A   
   A A               A A   
 A     A           A     A 
A A   A A         A A   A A
AAA   AAA         AAA   AAA
A A   A A         A A   A A
A A   A A         A A   A A
 A  A  A           A  A  A 
A AA AA A         A AA AA A
AAAAAAAAA         AAAAAAAAA
A AA AA A         A AA AA A
A AA AA A         A AA AA A
 A     A           A     A 
A A   A A         A A   A A
AAA   AAA         AAA   AAA
A A   A A         A A   A A
A A   A A         A A   A A
 A     A           A     A 
A A   A A         A A   A A
AAA   AAA         AAA   AAA
A A   A A         A A   A A
A A   A A         A A   A A
    A                 A    
   A A               A A   
   AAA               AAA   
   A A               A A   
   A A               A A   
 A     A           A     A 
A A   A A         A A   A A
AAA   AAA         AAA   AAA
A A   A A         A A   A A
A A   A A         A A   A A
 A  A  A           A  A  A 
A AA AA A         A AA AA A
AAAAAAAAA         AAAAAAAAA
A AA AA A         A AA AA A
A AA AA A         A AA AA A
 A     A           A     A 
A A   A A         A A   A A
AAA   AAA         AAA   AAA
A A   A A         A A   A A
A A   A A         A A   A A
 A     A           A     A 
A A   A A         A A   A A
AAA   AAA         AAA   AAA
A A   A A         A A   A A
A A   A A         A A   A A

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