我击败了所有人！！！！！！！！（C语言）

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

int main() {
    int n;
    scanf("%d", &n);
    int max0 = INT_MIN, min0 = INT_MAX;
    int max1 = INT_MIN, min1 = INT_MAX;
    int max2 = INT_MIN, min2 = INT_MAX;
    int count0 = 0, count1 = 0, count2 = 0; 
    
    for (int i = 0; i < n; i++) {
        int num;
        scanf("%d", &num);
        int mod = num % 3;
        if (mod == 0) {
            if (num > max0) max0 = num;
            if (num < min0) min0 = num;
            count0++;
        } else if (mod == 1) {
            if (num > max1) max1 = num;
            if (num < min1) min1 = num;
            count1++;
        } else { 
            if (num > max2) max2 = num;
            if (num < min2) min2 = num;
            count2++;
        }
    }
    
    int max_diff = -1;
    if (count0 >= 2) {
        int diff = max0 - min0;
        if (diff > max_diff) {
            max_diff = diff;
        }
    }
    if (count1 >= 2) {
        int diff = max1 - min1;
        if (diff > max_diff) {
            max_diff = diff;
        }
    }
    if (count2 >= 2) {
        int diff = max2 - min2;
        if (diff > max_diff) {
            max_diff = diff;
        }
    }
    
    printf("%d\n", max_diff);
    
    return 0;
}