I visited numberous website and algorithms, i am still not understand what is the different between ++i and i++.

And also, I don’t know how to use it, which situation should we use ++i instead of i++. Can someone explain it? Thank you so much!!!

#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;

int kadane(const vector<int>& nums) {
    if (nums.empty()) return 0;

    int max_current = nums[0], max_global = nums[0];

    for (size_t i = 1; i < nums.size(); ++i) {
        max_current = max(nums[i], max_current + nums[i]);
        if (max_current > max_global) {
            max_global = max_current;
        }
    }

    return max_global;
}

int main() {
    vector<int> nums = { -2, 1, -3, 4, -1, 2, 1, -5, 4 };
    cout << "Max sum of contiguous subarray: " << kadane(nums) << endl;
    return 0;
}

This is Kadane’s Algorithm, I saw ChatGPT using ++i instead of i++, I wonder why the bot used it