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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int nthFibonacciUtil(int n, vector<int>& memo) {
  5.     if (n <= 1) {
  6.         return n;
  7.     }
  8.     if (memo[n] != -1) {
  9.         return memo[n];
  10.     }
  11.     memo[n] = nthFibonacciUtil(n - 1, memo) 
  12.                        + nthFibonacciUtil(n - 2, memo);
  13.     return memo[n];
  14. }
  15.  
  16. int nthFibonacci(int n) {
  17.     vector<int> memo(n + 1, -1);
  18.     return nthFibonacciUtil(n, memo);
  19. }
  20.  
  21. int main() {
  22.     int n = 5;
  23.     int result = nthFibonacci(n);
  24.     cout << result << endl;
  25.     return 0;
  26. }
Success #stdin #stdout 0.01s 5276KB
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5
https://ideone.com/u6U5Ke
language:
C++14 (gcc 8.3)
created:
4 days ago
visibility:
public

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