leetcode 70 Climbing Stairs（难易度：Easy）
2015-09-08 07:01
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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?
代码：
int climbStairs(int n) {
if(n == 0 || n == 1 || n == 2)
return n;
int a = 2;
int b = 1;
int res = 0;
for(int i = 3; i <= n; i++)
{
res = a + b;
b = a;
a = res;
}
return res;
}
原题地址：https://leetcode.com/problems/climbing-stairs/
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