Sha256: 0928e3dc5a77307e5f9f8abe7ac616eceab294de814d75f232a463427b051c0d
Contents?: true
Size: 699 Bytes
Versions: 69
Compression:
Stored size: 699 Bytes
Contents
package queenattack
import "fmt"
const testVersion = 1
func CanQueenAttack(w, b string) (attack bool, err error) {
if err = valSq(w); err != nil {
return false, err
}
if err = valSq(b); err != nil {
return false, err
}
if w == b {
return false, fmt.Errorf("queens on same square")
}
if w[0] == b[0] || // same file
w[1] == b[1] { // same rank
return true, nil
}
df := w[0] - b[0]
dr := w[1] - b[1]
return df == dr || // same white-kingside diagonal
df+dr == 0, // same white-queenside diagonal
nil
}
func valSq(s string) error {
if len(s) != 2 ||
s[0] < 'a' || s[0] > 'h' ||
s[1] < '1' || s[1] > '8' {
return fmt.Errorf("invalid square: %q", s)
}
return nil
}
Version data entries
69 entries across 69 versions & 1 rubygems