kadane.cpp

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#include <array>
#include <climits>
#include <iostream>
namespace dynamic_programming {
namespace kadane {
template <size_t N>
int maxSubArray(const std::array<int, N> &n) {
    int curr_sum =
        0;  // declaring a variable named as curr_sum and initialized it to 0
    int max_sum = INT_MIN;  // Initialized max_sum to INT_MIN
    for (int i : n) {  // for loop to iterate over the elements of the array
        curr_sum += n[i];
        max_sum = std::max(max_sum, curr_sum);  // getting the maximum value
        curr_sum = std::max(curr_sum, 0);  // updating the value of curr_sum
    }
    return max_sum;  // returning the value of max_sum
}
}  // namespace kadane
}  // namespace dynamic_programming
 
int main() {
    const int N = 5;
    std::array<int, N> n{};  // declaring array
                             // taking values of elements from user
    for (int i = 0; i < n.size(); i++) {
        std::cout << "Enter value of n[" << i << "]"
                  << "\n";
        std::cin >> n[i];
    }
    int max_sum = dynamic_programming::kadane::maxSubArray<N>(
        n);  // calling maxSubArray function
    std::cout << "Maximum subarray sum is " << max_sum;  // Printing the answer
 
    return 0;
}