1 //Accepted    208 KB    157 ms 2 //纯暴力 3 //vis数组初始化时要用多少设置多少，不然TLE 4 #include <cstdio> 5 #include <cstring> 6 #include <iostream> 7 using namespace std; 8 const int imax_n = 1000005; 9 int a[imax_n];10 bool vis[imax_n];11 int n;12 bool slove(int k)13 {14     memset(vis,false,k*sizeof(vis[0]));15     for (int i=1;i<=n;i++)16     {17         int t=a[i]%k;18         if (vis[t]) return false;19         vis[t]=true;20     }21     return true;22 }23 int main()24 {25     int T;26     scanf("%d",&T);27     for  (int t=1;t<=T;t++)28     {29         scanf("%d",&n);30         for (int i=1;i<=n;i++)31         scanf("%d",&a[i]);32         int k=n;33         while (slove(k)==false) k++;34         printf("%d\n",k);35     }36     return 0;37 }