Anyone can solve the time limit exceeded problem?

  • 0

    I wrote like this. But after I submitted, it shows Time Limit Exceeded when n == 44.
    Anyone can help me figure out why this happened?

    public class Solution {
        public int climbStairs(int n) {
            if (n < 4) return n;
            return climbStairs(n - 1) + climbStairs(n - 2);

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