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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int climbStairs(int n) {
  5.     int f1 = 2;
  6.     int f2 = 1;
  7.     if(n == 1) {
  8.         return f2;
  9.     } else if(n == 2) {
  10.         return f1;
  11.     }
  12.  
  13.     int fn;
  14.     for(int i = 3; i <= n; i++) {
  15.         fn = f1 + f2;
  16.         f2 = f1;
  17.         f1 = fn;
  18.     }
  19.     return fn;
  20. }
  21.  
  22. int main() {
  23. 	cout << climbStairs(5);
  24. 	return 0;
  25. }
Success #stdin #stdout 0s 16064KB
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https://ideone.com/ErEU6E
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
secret

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