hdu--2503 统计第几小数（非常精炼）

#include "iostream"#include "algorithm"using namespace std;int main(){ int i,n,m,t,j,k,temp,a[1002],flag,u,max;int sum[10000];scanf("%d",&t);while (t--){memset(sum,0,sizeof(sum));scanf("%d %d",&n,&m); for(i=0;i<n;i++) scanf("%d",&a[i]);for (i=0;i<n;i++){for(j=0;j<i;j++){sum[abs(a[i]-a[j])]=1;}}j=0;while (m){m-=sum[j++];}printf("%d/n",j-1);}return 0;}