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Board.swift

import Foundation

struct board<T> {
    let w: Int
    let h: Int
    var board: [T]
    init(w: Int, h: Int, v: T) {
        self.w = w
        self.h = h
        self.board = [T].init(repeating: v, count: w*h)
    }
    
    subscript(w: Int, h: Int) -> T {
        get {
            return board[h * self.w + w]
        }
        set {
            board[h * self.w + w] = newValue
        }
    }
}

var b = board(w: 3, h: 4, v: 0)

print(b.board)

b[0, 0] = 1
b[1, 2] = 2
b[2, 3] = 3

print(b.board)

for y in 0..<b.h {
    for x in 0..<b.w {
        print(b[x, y], terminator: " ")
    }
    print()
}

///////////////////////////////////////////////////////////////

let s = ["CCBDE", "AAADE", "AAABF", "CCBBF"]

// copy
var myboard = board(w: s[0].count, h: s.count, v: " ")
var check = board(w: s[0].count, h: s.count, v: false)
for (y, sr) in s.enumerated() {
    for (x, sc) in sr.enumerated() {
        myboard[x, y] = String(sc)
    }
}

// print
print(myboard.board)
print(check.board)
for y in 0..<myboard.h {
    for x in 0..<myboard.w {
        print(myboard[x, y], terminator: " ")
    }
    print()
}

// check block
for y in 0..<myboard.h-1 {
    for x in 0..<myboard.w-1 {
        let char = myboard[x, y]
        if char == " " {
            continue
        }
        if char == myboard[x+1, y]
            && char == myboard[x+1, y+1]
            && char == myboard[x, y+1] {
            check[x, y] = true
            check[x+1, y] = true
            check[x, y+1] = true
            check[x+1, y+1] = true
        }
    }
}

// print check
for y in 0..<check.h {
    for x in 0..<check.w {
        print(check[x, y], terminator: " ")
    }
    print()
}

// change block
// remove dupli
for y in 0..<check.h {
    for x in 0..<check.w {
        if check[x, y] == true {
            myboard[x, y] = " "
        }
    }
}

// print board
for y in 0..<myboard.h {
    for x in 0..<myboard.w {
        print(myboard[x, y], terminator: " ")
    }
    print()
}

// down blocks
// fill buffer with " "
for x in 0..<myboard.w {
    var buffer: [String] = [String].init(repeatElement(" ", count: myboard.h))
    for y in 0..<myboard.h {
        if myboard[x, y] != " " {
            buffer.insert(myboard[x, y], at: 0) // insert front, count = height+1
            _ = buffer.removeLast() // count = height
        }
    }
    for y in 0..<myboard.h {
        myboard[x, y] = buffer.popLast()!
    }
}

// print board
for y in 0..<myboard.h {
    for x in 0..<myboard.w {
        print(myboard[x, y], terminator: " ")
    }
    print()
}