最近遇到的一些编程题

Posted 2020-10-22 longwind09，多容寡欲，千里江河

一些经典的编程题

连续最大子数组

#include <iostream>

using namespace std;


/**
 * get the index of max sum sub array and the sum
 * @param arr the given array
 * @param low the lowwer bound of the array
 * @param high the upper bound of the array
 */
void get_max_arr(const int *arr, int low, int high) {
    if(nullptr == arr || high < 0){
        return;
    }
    int sum = -9999,temp_sum = 0;
    int begin = 0, index_1 = 0, index_2 = 0;

    for (int i = low; i <= high; ++i) {
        temp_sum += arr[i];
        if (temp_sum > sum) {
            sum = temp_sum;
            index_2 = i;
            index_1 = begin;
        }
        if (temp_sum < 0) {
            temp_sum = 0;
            begin = i + 1;
        }

    }
    cout << index_1 << " " << index_2 << endl;
    cout << sum << endl;
}


int main() {
//        int arr[] = {};
    int arr[] = {-2,-2,-3};
//    int arr[] = {-1, 0, 2, -2, -3, 4, 5, -9, 3, -5};
//    int arr[] = {-9,  -2, -3, -4, -5, -9, -3, -5};

    int size = sizeof(arr) / sizeof(int);
    get_max_arr(arr, 0, size - 1);
    return 0;
}