cbj

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <string.h>
#include <ctype.h>
#pragma warning(disable:4996)
typedef long long LL;
typedef unsigned long long ULL;
void minmax(int *a, int len, int *max, int *min){
    int i;
    *max = *min = a[0];
    for(i = 0;i < len;i++){
        if(a[i] > *max){
            *max = a[i];
        }
        if(a[i] < *min){
            *min = a[i];
        }
    }
}
int main(){
#ifdef _DEBUG
    FILE *fp = freopen("input.txt", "r", stdin);
    //FILE *fp2 = freopen("output.txt", "w", stdout);
#endif // _DEBUG
    int t, n, m, M, a[1024] = { 0 }, i;
    scanf("%d", &t);
    while(t--){
        scanf("%d", &n);
        for(i = 0;i < n;i++){
            scanf("%d", a + i);
        }
        minmax(a, n, &M, &m);
        printf("%d\n", M - m);
    }

#ifdef _DEBUG
    freopen("CON", "r", stdin);
    //freopen("CON", "w", stdout);
    system("pause");
#endif // _DEBUG
    return 0;
}