climbing-stairs.cpp

class Solution {
public:
    int climbStairs(int n) {
        int steps[n+2];
        steps[1] = 1;
        steps[2] = 2;
        for (int i = 3; i <= n; i++) {
            steps[i] = steps[i-1] + steps[i-2];
        }
        return steps[n];
    }
};