HDU2034

#include<stdio.h>#include<stdlib.h>#include<algorithm>using namespace std;int cmp(const void *m,const void *n){    return (*(int *)m-*(int *)n);}int main(){    int m,n,i,c1[101],c2[101];    while(scanf("%d%d",&m,&n)&&(m|n)){        for (i=0;i<m;i++)        scanf("%d",&c1[i]);        for (i=0;i<n;i++)        scanf("%d",&c2[i]);        sort(c1,c1+m);        sort(c2,c2+n);        int judge=1;        for (i=0;i<m;i++){            if(!bsearch(c1+i,c2,n,sizeof(int),cmp))            {                printf("%d ",c1[i]);                judge=0;            }        }        if(judge)        printf("NULL\n");        else printf("\n");    }    return 0;}