Sha256: cff50f6d9cb6c1b98729761528772562a672724d9e9b669b79ddab47edff080e
Contents?: true
Size: 699 Bytes
Versions: 205
Compression:
Stored size: 699 Bytes
Contents
package queenattack
import "fmt"
const testVersion = 2
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
205 entries across 205 versions & 1 rubygems