remove aoc solutions

examples/euler/euler_12.zr

@@ -0,0 +1,21 @@
+func num_divisors[n: i64] : i64
+    end := n->isqrt()
+
+    out := 0
+    for i in 1..end+1
+        if n % i == 0
+            out += 2
+
+    if end * end == n
+        out -= 1
+    return out
+
+func main[] : i64
+    n := 0
+    i := 1
+    while true
+        n += i
+        if num_divisors(n) > 500
+            io.println_i64(n)
+            break
+        i += 1