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Climbing Stairs
题目
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?
方法
从后往前求解问题,相当于一维动态规划,但是可以不用数组保存。递推公式与斐波那契额数列类似。public int climbStairs(int n) { if (n == 0 || n == 1) { return n; } int a = 1; int b = 2; int c; for (int i = 3; i <= n; i++) { c = a + b; a = b; b = c; } return b; }
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