Created
February 2, 2022 03:23
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Recursive function memo
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#include <iostream> | |
#include <vector> | |
// Sum of array elements | |
// sum of [i, i+1] = [i] + [i+1] | |
int array_sum_from_i(std::vector<int> &data, int i) { | |
// Base | |
if (i == data.size()) return 0; | |
// Recursive | |
int s = array_sum_from_i(data, i+1); | |
return data[i] + s; | |
} | |
int array_sum(std::vector<int> &data) { | |
return array_sum_from_i(data, 0); | |
} | |
int main() { | |
std::vector<int> a = {0,1,2,3}; | |
std::cout << array_sum(a) << std::endl; | |
std::vector<int> b = {}; | |
std::cout << array_sum(b) << std::endl; | |
std::vector<int> c = {5,5,5,5,5}; | |
std::cout << array_sum(c) << std::endl; | |
} | |
/* output | |
6 | |
0 | |
25 | |
*/ |
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