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Fibonacci iterative and recursive #1495

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Fibonacci iterative and recursive #1495

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8182a2a
Add iterative implementation
SebastianSosnowski Jan 6, 2026
5327895
Add recursive implementation
SebastianSosnowski Jan 6, 2026
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19 changes: 17 additions & 2 deletions homework/fibonacci/fibonacci.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2,10 +2,25 @@

int fibonacci_iterative(int sequence) {
// TODO: Your implementation goes here
return 0;
if (sequence == 0 or sequence == 1)
return sequence;
if (sequence < 0)
return -1;

int curr{0}, prev_prev{0}, prev{1};
for (int i = 2; i <= sequence; i++) {
curr = prev_prev + prev;
prev_prev = prev;
prev = curr;
}
return curr;
}

int fibonacci_recursive(int sequence) {
// TODO: Your implementation goes here
return 0;
if (sequence == 0 or sequence == 1)
return sequence;
int prev = fibonacci_recursive(sequence - 1);
int prev_prev = fibonacci_recursive(sequence - 2);
return prev + prev_prev;
}