det ochka

#include <stdio.h>

void read_vectors(int dim, float[] x, float[] y, float[] z);
float calculate_mult(int dim, float[] p, float[] q);
float min_coord(int dim, float[] t);
void who_is_who(int dim, float[] x, float[] y, float[] z, float[] a, float[] b, float[] c);

int main(void) {

    int const DIM = 10;

    int dim;
    float x[DIM], y[DIM], z[DIM], a[DIM], b[DIM], c[DIM];
    float answer;

    scanf("%d", &dim);
    read_vectors(dim, x, y, z);

    who_is_who(dim, x, y, z, a, b, c);

    answer = calculate_mult(a, a) - calculate_mult(b, c);

    printf("%f", answer);


    return 0;

}

void read_vectors(int dim, float[] x, float[] y, float[] z) {
    for (int i = 0; i < dim; i++) { scanf("%f", &x[i]); }
    for (int i = 0; i < dim; i++) { scanf("%f", &y[i]); }
    for (int i = 0; i < dim; i++) { scanf("%f", &z[i]); }
}

float calculate_mult(int dim, float[] p, float[] q) {
    float result = 0;
    for (int i = 0; i < dim; i++) {
        result += p[i]*q[i];
    }
    return result;
}

float min_coord(int dim, float[] t) {
    float min = t[0];
    for (int i = 1; i < dim; i++) {
        if (t[i] < min) {
            min = t[i];
        }
    }
    return min;
}

void who_is_who(int dim, float[] x, float[] y, float[] z, float[] a, float[] b, float[] c) {
    float t;
    float max = min_coord(dim, x);
    a = x;
    b = y;
    c = z;

    t = min_coord(dim, y);
    if (t > max) {
        max = t;
        a = y;
        b = x;
        c = z;
    }

    t = min_coord(dim, z);
    if (t > max) {
        max = t;
        a = z;
        b = x;
        c = y;
    }
}