lab_1

#include <stdio.h>
#include <stdlib.h>
#define MAX_SIZE 101


int index_first_negative(int arr[], int array_size){
    int index = 0;
    for(int i = 0; i < array_size; i++){
        if(arr[i] < 0){
            index = i;
            break;
        }
    }
    return index;
}


int index_last_negative(int arr[], int array_size){
    int index = 0;
    for(int i = array_size - 1; i > -1; i--){
        if(arr[i] < 0){
            index = i;
            break;
        }
    }
    return index;
}


int sum_between_negative(int arr[], int array_size){
    int sum = 0;
    int first_negative_index = index_first_negative(arr, array_size);
    int last_negative_index = index_last_negative(arr, array_size);
    for(int i = first_negative_index; i < last_negative_index; i++)
        sum += abs(arr[i]); //подсчет суммы
    return sum;
}


int sum_before_and_after_negative(int arr[], int array_size){
    int sum = 0;
    int first_negative_index = index_first_negative(arr, array_size);
    int last_negative_index = index_last_negative(arr, array_size);
    for(int i = 0; i < first_negative_index; i++)
        sum += abs(arr[i]);
    for(int i = last_negative_index; i < array_size; i++)
        sum += abs(arr[i]);
    return sum;
}

int main(){
    char c;
    int task, actual_arr_size = 0, arr[MAX_SIZE];
    scanf("%d", &task);
    for(int i = 0; i <= MAX_SIZE; i++){
        scanf("%d%c", &arr[i], &c);
        if(i == MAX_SIZE || c == '\n'){
            actual_arr_size = i + 1;
            break;
        }
    }
    switch(task){
        case(0):
            printf("%d\n", index_first_negative(arr, actual_arr_size));
            break;
        case(1):
            printf("%d\n", index_last_negative(arr, actual_arr_size));
            break;
        case(2):
            printf("%d\n", sum_between_negative(arr, actual_arr_size));
            break;
        case(3):
            printf("%d\n", sum_before_and_after_negative(arr, actual_arr_size));
            break;
        default:
            puts("Данные некорректны");

    }
    return 0;
}