3

#include <stdio.h>
#include <math.h>

#define MAX_SIZE 10

int input(int *array, int *size);
void output(const int *array, int size);
int find_max(const int *array, int size);
int find_min(const int *array, int size);
double calculate_mean(const int *array, int size);
double calculate_variance(const int *array, int size);
void output_statistics(int max_value, int min_value, double mean_value, double variance_value);

int main() {
    int size;
    int numbers[MAX_SIZE];
    int input_result;

    input_result = input(numbers, &size);
    if (input_result == 0) {
        output(numbers, size);
        output_statistics(
            find_max(numbers, size),
            find_min(numbers, size),
            calculate_mean(numbers, size),
            calculate_variance(numbers, size)
        );
    } else {
        printf("n/a");
        return 1;
    }

    return 0;
}

int input(int *array, int *size) {
    if (scanf("%d", size) != 1 || *size <= 0 || *size > MAX_SIZE) {
        return 1;
    }

    char separator;
    for (int i = 0; i < *size; i++) {
        if (scanf("%d", &array[i]) != 1) {
            return 1;
        }

        separator = getchar();
        if (i < *size - 1 && separator != ' ') {
            return 1;
        } else if (i == *size - 1 && separator != '\n') {
            return 1;
        }
    }

    return 0;
}

void output(const int *array, int size) {
    for (int i = 0; i < size; i++) {
        printf("%d", array[i]);
        if (i < size - 1) {
            printf(" ");
        }
    }
}

int find_max(const int *array, int size) {
    int max_value = array[0];
    for (int i = 1; i < size; i++) {
        if (array[i] > max_value) {
            max_value = array[i];
        }
    }
    return max_value;
}

int find_min(const int *array, int size) {
    int min_value = array[0];
    for (int i = 1; i < size; i++) {
        if (array[i] < min_value) {
            min_value = array[i];
        }
    }
    return min_value;
}

double calculate_mean(const int *array, int size) {
    double sum = 0.0;
    for (int i = 0; i < size; i++) {
        sum += array[i];
    }
    return sum / size;
}

double calculate_variance(const int *array, int size) {
    double mean = calculate_mean(array, size);
    double sum_squared_diff = 0.0;

    for (int i = 0; i < size; i++) {
        sum_squared_diff += pow(array[i] - mean, 2);
    }

    return sum_squared_diff / size;
}

void output_statistics(int max_value, int min_value, double mean_value, double variance_value) {
    printf("\n%d %d %.6f %.6f", max_value, min_value, mean_value, variance_value);
}