C++/简单代码/三行：
变态跳台阶
http://www.nowcoder.com/questionTerminal/22243d016f6b47f2a6928b4313c85387
C++/简单代码/三行：
class Solution {
public:
int jumpFloorII(int number) {
int res = 1;
for (int i = 2; i <= number; i ++) res *= 2;
return res;
}
};
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