From eb5f3b18b7e40e233d98df16043e3277f02ba94c Mon Sep 17 00:00:00 2001
From: m-hgn <markichnich@proton.me>
Date: Mon, 1 May 2023 23:49:29 +0200
Subject: [PATCH] add v version.

---
 makefile | 14 +++++++-------
 snail.v  | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 56 insertions(+), 7 deletions(-)
 create mode 100644 snail.v

diff --git a/makefile b/makefile
index ceb20b5..d08457d 100644
--- a/makefile
+++ b/makefile
@@ -1,14 +1,9 @@
 bd = ./build/
 
-all: c d nim odin __python rust
+all: c d nim odin __python rust v
 
 build-run: all
-	$(bd)c
-	$(bd)d
-	$(bd)nim
-	$(bd)odin
-	./snail.py
-	$(bd)rust
+	make run
 
 run:
 	$(bd)c
@@ -17,6 +12,7 @@ run:
 	$(bd)odin
 	./snail.py
 	$(bd)rust
+	$(bd)v
 
 clean:
 	rm -f $(bd)*
@@ -44,3 +40,7 @@ rust: snail.rs
 	rustc $^ -o $(bd)$@
 	$(bd)$@
 
+v: snail.v
+	v $^ -o $(bd)$@
+	$(bd)$@
+
diff --git a/snail.v b/snail.v
new file mode 100644
index 0000000..9768bab
--- /dev/null
+++ b/snail.v
@@ -0,0 +1,49 @@
+fn (xss [][]int) snail() []int {
+	mut ys := []int{}
+
+	h := xss.len
+	if h == 0 { return ys }
+	w := xss[0].len
+	if w == 0 { return ys }
+
+	for b in 0 .. (max(h, w)) {
+		ex := w - b - 1
+		ey := h - b - 1
+
+		for c in b .. (ex + 1)       { ys << xss[b][c] }
+		for r in (b + 1) .. (ey + 1) { ys << xss[r][ex] }
+
+		if ex == b || ey == b { return ys }
+
+		for c in (b + 1) .. (ex + 1) { ys << xss[ey][ex - c] }
+		for r in (b + 1) .. ey       { ys << xss[ey - r][b] }
+	}
+	return ys
+}
+
+fn max(a int, b int) int { if a > b { return a } else { return b } }
+
+fn main() {
+	mut initial := [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
+	mut expected := [1, 2, 3, 6, 9, 8, 7, 4, 5]
+	assert initial.snail() == expected
+	println(initial.snail() == expected)
+
+	initial = [[1, 2, 3, 4], [5, 6, 7, 8], [9, 10, 11, 12]]
+	expected = [1, 2, 3, 4, 8, 12, 11, 10, 9, 5, 6, 7]
+	assert initial.snail() == expected
+	println(initial.snail() == expected)
+
+	initial = [
+        [1, 2, 3],
+        [4, 5, 6],
+        [7, 8, 9], 
+        [10, 11, 12], 
+        [13, 14, 15]
+    ]
+	expected = [1, 2, 3, 6, 9, 12, 15, 14, 13, 10, 7, 4, 5, 8, 11]
+	assert initial.snail() == expected
+	println(initial.snail() == expected)
+
+	println('all tests passed')
+}