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fn fibonacci_fold(n: i32) -> i32 { + (0..n).fold((0, 1), |(a, b), _| (b, a + b)).1 +} diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..76a7df0 --- /dev/null +++ b/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); + } +}