Data commit

Task/Random-Latin-squares/JavaScript/random-latin-squares.js

@@ -0,0 +1,52 @@
+class Latin {
+  constructor(size = 3) {
+    this.size = size;
+    this.mst = [...Array(this.size)].map((v, i) => i + 1);
+    this.square = Array(this.size).fill(0).map(() => Array(this.size).fill(0));
+
+    if (this.create(0, 0)) {
+      console.table(this.square);
+    }
+  }
+
+  create(c, r) {
+    const d = [...this.mst];
+    let s;
+    while (true) {
+      do {
+        s = d.splice(Math.floor(Math.random() * d.length), 1)[0];
+        if (!s) return false;
+      } while (this.check(s, c, r));
+
+      this.square[c][r] = s;
+      if (++c >= this.size) {
+        c = 0;
+        if (++r >= this.size) {
+          return true;
+        }
+      }
+      if (this.create(c, r)) return true;
+      if (--c < 0) {
+        c = this.size - 1;
+        if (--r < 0) {
+          return false;
+        }
+      }
+    }
+  }
+
+  check(d, c, r) {
+    for (let a = 0; a < this.size; a++) {
+      if (c - a > -1) {
+        if (this.square[c - a][r] === d)
+          return true;
+      }
+      if (r - a > -1) {
+        if (this.square[c][r - a] === d)
+          return true;
+      }
+    }
+    return false;
+  }
+}
+new Latin(5);