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package tris
func (f Field) Lines() (int, Field) {
full := [10]bool{true, true, true, true, true, true, true, true, true, true}
empty := [10]bool{false, false, false, false, false, false, false, false, false, false}
var n int
var nf [][10]bool
// count and collect
for _, line := range f {
if line == full {
n++
} else {
nf = append(nf, line)
}
}
// compress
for i := 0; i < 20; i++ {
if i < n {
f[i] = empty
} else {
f[i] = nf[i-n]
}
}
return n, f
}
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