动态规划（DP）

动态规划，Dynamic programming,不是Dynamic planning ...

将问题分成若干子问题，前面的解为后面的解所用，注意逆向推倒，找出递推公式，经典的01背包问题，晚点实现一下，这里搞一个LeetCode上面的题放着记录一下

神马求二项式系数，斐波拉契...都可以用动态规划来实现

Climbing Stairs

You are climbing a stair case. It takes n steps to reach to the top.

Each time you can either climb 1 or 2 steps. In how many distinct ways can you climb to the top?

public class Solution {
    public int climbStairs(int n) {
        int steps[] = new int[n + 1];
        for(int i = 0; i <= n; i++){
            if(0 == i || 1 == i)
                steps[i] = 1;
            else{
                steps[i] = steps[i - 1] + steps[i - 2];
            }
        }
        return steps[n];
    }
}

01背包问题，待写...