#include <stddef.h>
#include <stdio.h>
#include <limits.h>

typedef struct {
    char r;
    char g;
    char b;
} Color;

int main(void) {
    const size_t length = 1024;
    Color inputs[length];
    // ... input initialization ...
    for (size_t i = 0; i < length; i++) {
        inputs[i].r = (i * 3) % 255;
        inputs[i].g = (i * 5) % 255;
        inputs[i].b = (i * 7) % 255;
    }
    // ... resume calculation ...
    long long total = 0;
    int min = INT_MIN;
    int max = INT_MAX;
    for (size_t i = 0; i < length; i++) {
        Color cc = inputs[i];
        total += cc.r*cc.r + cc.g*cc.g + cc.b*cc.b;
        min = arr[i] < min ? arr[i] : min;
        max = arr[i] > min ? arr[i] : min;
    }
    printf(
        "min: %d, max: %d, avrg: %ld\n",
        min, max, total / (long long) length
    );
}