oppgaver så langt

climbing-stairs-70/src/main.rs

@@ -0,0 +1,37 @@
+fn climb_stairs_on2(n: i32) -> i32 {
+    if n == 1 {
+        return 1;
+    }
+
+    if n == 2 {
+        return 2;
+    }
+
+    let sol = climb_stairs(n - 2) + climb_stairs(n - 1);
+
+    sol
+}
+
+fn climb_stairs(n: i32) -> i32 {
+    if n == 1 {
+        return 1;
+    }
+    if n == 2 {
+        return 2;
+    }
+
+    let mut prev = 1;
+    let mut curr = 2;
+
+    for _ in 3..=n {
+        let next = prev + curr;
+        prev = curr;
+        curr = next;
+    }
+
+    curr
+}
+
+fn main() {
+    println!("{}", climb_stairs(4));
+}