task 1 improved

#include <stdio.h>
#include <stdlib.h>
#include <time.h>#define N 5
#define N1 80
#define N2 35
int main(){int cnt;int r;//random_major,random_no;
srand(time(NULL));
//new:未被选的人员数 int u1=N1,u2=N2;cnt=0;while(cnt < N) {
//        random_major = rand()%2;
//        if(random_major){
//            random_no = rand()%N1+1;
//            printf("20256343%04d\n",random_no);
//        }else{
//            random_no=rand()%N2+1;
//            printf("20256136%04d\n",random_no);
//        }
//        cnt++;//假如我想等比例分层抽样，同时防止重复，可以：cnt++;r=rand()%(u1+u2)+1;//[1,u1+u2]if(r<=u1){//[1,u1]printf("20256343%04d\n",r);u1--;}else{//[u1+1,u1+u2]printf("20256136%04d\n",r-u1);u2--;} }return 0;
}