70. Climbing Stairs 🌟

You are climbing a staircase. It takes n steps to reach the top. Each time you can either climb 1 or 2 steps. In how many distinct ways can you climb to the top?

Dynamic Programming

class Solution {
public:
    int climbStairs(int n) {
        vector<int> dp(n+1);
        dp[0]=1;
        dp[1]=1;
        for(int i=2;i<=n ;i++){
            dp[i]=dp[i-1]+dp[i-2];
        }
        return dp[n];
    }
};