add examples

src/beatspread.lua

@@ -0,0 +1,8 @@
+for _ = 1, io.read("*n") do
+    a, b = io.read("*n", "*n")
+    if a < b or (a + b) % 2 == 1 then
+        print("impossible")
+    else
+        print((a + b) // 2, (a - b) // 2)
+    end
+end

src/password.py

@@ -0,0 +1,3 @@
+n = int(input())
+p = [float(input().split()[-1]) for _ in range(n)]
+print(sum(a * b for a, b in zip(sorted(p, reverse=True), range(1, n + 1))))