题解

# include<iostream>
# include<cmath>
using namespace std;
void f()
{
	int n,a[53],min,t;
	cin>>n;
	for(int i=0;i<n;++i) cin>>a[i];
    min=abs(a[0]-a[1]);
	for(int i=0;i<n;++i){
		for(int j=i+1;j<n;++j){
			t=abs(a[i]-a[j]);
			if(t<min) min=t;
		}
	}
	cout<<min<<endl;
}
int main(){
	int t;
	cin>>t;
	for(int i=0;i<t;++i) f();
	return 0;
}