52 lines
1.6 KiB
Rust
52 lines
1.6 KiB
Rust
// 8 |_|#|_|#|_|#|_|#|
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// 7 |#|_|#|_|#|_|#|_|
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// 6 |_|#|_|#|_|#|_|#|
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// 5 |#|_|#|_|#|_|#|_|
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// 4 |_|#|_|#|_|#|_|#|
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// 3 |#|_|#|_|#|_|#|_|
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// 2 |_|#|_|#|_|#|_|#|
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// 1 |#|_|#|_|#|_|#|_|
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// a b c d e f g h
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fn bishop(start_pos: &str, end_pos: &str, num_moves: u8) -> bool {
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let (x1, y1) = get_coords(start_pos);
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let (x2, y2) = get_coords(end_pos);
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let is_same_position = start_pos == end_pos;
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let is_same_color = (x1 + y1) % 2 == (x2 + y2) % 2;
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let is_same_line = (x1 - x2).abs() == (y1 - y2).abs();
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match num_moves {
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0 => is_same_position,
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1 => is_same_line,
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_ => is_same_color,
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}
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}
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fn get_coords(pos: &str) -> (i8, i8) {
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let mut chars = pos.chars();
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let x = chars.next().unwrap() as i8 - ('a' as i8);
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let y = chars.next().unwrap() as i8 - ('1' as i8);
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(x, y)
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}
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#[test]
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fn test_basic() {
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assert_eq!(bishop("a1", "b4", 2), true);
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assert_eq!(bishop("a1", "b4", 2), true);
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assert_eq!(bishop("a1", "b5", 5), false);
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assert_eq!(bishop("f1", "f1", 0), true);
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assert_eq!(bishop("e6", "a1", 2), false);
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assert_eq!(bishop("h2", "a2", 1), false);
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assert_eq!(bishop("d1", "a3", 1), false);
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assert_eq!(bishop("b2", "a4", 2), false);
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assert_eq!(bishop("d7", "a5", 0), false);
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assert_eq!(bishop("e7", "a6", 2), false);
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assert_eq!(bishop("d1", "a7", 1), false);
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assert_eq!(bishop("c6", "a8", 2), true);
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assert_eq!(bishop("d7", "b1", 1), false);
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assert_eq!(bishop("e5", "b2", 2), true);
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assert_eq!(bishop("c7", "b3", 0), false);
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assert_eq!(bishop("b4", "b4", 1), true);
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assert_eq!(bishop("h5", "b5", 1), false);
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}
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