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;
}