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[DaleSeo] WEEK 2 Solutions #2415

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Merged
DaleSeo merged 1 commit into from
Mar 14, 2026
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[DaleSeo] WEEK 2 Solutions #2415

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16 changes: 16 additions & 0 deletions climbing-stairs/DaleSeo.rs
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Original file line number Diff line number Diff line change
@@ -0,0 +1,16 @@
// TC: O(n)
// SC: O(1)
impl Solution {
pub fn climb_stairs(n: i32) -> i32 {
if n < 3 {
return n;
}
let (mut pre, mut cur) = (1, 2);
for _ in 3..=n {
let next = pre + cur;
pre = cur;
cur = next;
}
cur
}
}
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