First commit

.gitignore

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Cargo.toml

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+name = "issue-77"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+[dev-dependencies]
+divan = "0.1.21"
+
+[[bench]]
+name = "bench"
+harness = false

benches/bench.rs

@@ -0,0 +1,18 @@
+fn main() {
+    divan::main();
+}
+
+#[divan::bench(args = [1, 2, 4, 8, 16, 32, 64, 128])]
+pub fn fibonacci_loop(n: i32) -> i32 {
+    let mut a = 0;
+    let mut b = 1;
+    for _ in 0..n {
+        (a, b) = (b, a + b);
+    }
+    b
+}
+
+#[divan::bench(args = [1, 2, 4, 8, 16, 32, 64, 128])]
+pub fn fibonacci_fold(n: i32) -> i32 {
+    (0..n).fold((0, 1), |(a, b), _| (b, a + b)).1
+}

src/main.rs

@@ -0,0 +1,69 @@
+// Rust Bytes Issue 77: Climbing Stairs
+pub fn main() {}
+pub fn climb_stairs2(n: i32) -> i32 {
+    let mut a = 0;
+    let mut b = 1;
+    for _ in 0..n {
+        (a, b) = (b, a + b);
+    }
+    b
+}
+
+pub fn climb_stairs(n: i32) -> i32 {
+    (0..n).fold((0, 1), |(a, b), _| (b, a + b)).1
+}
+
+#[cfg(test)]
+mod tests {
+    use super::climb_stairs;
+
+    #[test]
+    fn test_zero_steps() {
+        assert_eq!(climb_stairs(0), 1);
+    }
+
+    #[test]
+    fn test_one_step() {
+        assert_eq!(climb_stairs(1), 1);
+    }
+
+    #[test]
+    fn test_two_steps() {
+        assert_eq!(climb_stairs(2), 2);
+    }
+
+    #[test]
+    fn test_three_steps() {
+        assert_eq!(climb_stairs(3), 3);
+    }
+
+    #[test]
+    fn test_four_steps() {
+        assert_eq!(climb_stairs(4), 5);
+    }
+
+    #[test]
+    fn test_five_steps() {
+        assert_eq!(climb_stairs(5), 8);
+    }
+
+    #[test]
+    fn test_six_steps() {
+        assert_eq!(climb_stairs(6), 13);
+    }
+
+    #[test]
+    fn test_small_negative() {
+        assert_eq!(climb_stairs(-1), 1);
+    }
+
+    #[test]
+    fn test_seven_steps() {
+        assert_eq!(climb_stairs(7), 21);
+    }
+
+    #[test]
+    fn test_ten_steps() {
+        assert_eq!(climb_stairs(10), 89);
+    }
+}