⑰チャレンジしよう！の解答例

  
color(0) //透明
for i in 1...3 {
for j in 1...4-i {
drop(i)
drop(11-i)
}
}
color(1) //赤
for i in 1...10 {
drop(i)
}
color(0) //透明
for i in 2...9 {
    for j in 1...4-count(i)
    {
        drop(i)
    }
}
for i in 1...10 {
    for j in 1...3 {
        color(0) //透明
        if (i==1){
            color(1) //赤
        }
        if (i==10) {
            color(1) //赤
        }
        drop(i)
    }
}
color(0) //透明
for i in 3...8 {
    drop(i)
}
for i in 4...7 {
    drop(i)
}
color(1) //赤
for i in 2...9 {
    drop(i)
}