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fibonacci_number.cpp
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44 lines (37 loc) · 821 Bytes
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#include "fibonacci_number.h"
auto Fibonacci::FibonacciDynamicTopDown(const int number, std::vector<int>& memo) -> int
{
if (number == 0)
{
return 0;
}
if (number == 1)
{
return 1;
}
if (memo[number] > 0)
{
return memo[number];
}
memo[number] = FibonacciDynamicTopDown(number - 1, memo) + FibonacciDynamicTopDown(number - 2, memo);
return memo[number];
}
auto Fibonacci::FibonacciDynamicBottomUp(const int number) -> int
{
if (number == 0)
{
return 0;
}
if (number == 1)
{
return 1;
}
std::vector<int> memo(number + 1, -1);
memo[0] = 0;
memo[1] = 1;
for (int i = 2; i < number; ++i)
{
memo[i] = memo[i - 1] + memo[i - 2];
}
return memo[number - 1] + memo[number - 2];
}