41 lines
674 B
C++
41 lines
674 B
C++
#include <cstdio>
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#include <cstdlib>
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#include <cstring>
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#include <algorithm>
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using namespace std;
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int a[2048];
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int b[2048];
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int x[4096];
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int c;
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int d;
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int main()
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{
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int t;
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scanf("%d",&t);
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for(int i=0;i<t;i++)
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{
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scanf("%d",&a[c++]);
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}
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scanf("%d",&t);
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for(int i=0;i<t;i++)
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{
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scanf("%d",&b[d++]);
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}
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int* p=set_difference(a,a+c,b,b+d,x);
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int dd=p-x;
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if(dd==0)
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{
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printf("NULL\n");
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/// 题目似乎有问题...
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/// printf("0\n");
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return 0;
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}
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for(int i=0;i<dd-1;i++)
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{
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printf("%d ",x[i]);
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}
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printf("%d\n",x[dd-1]);
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printf("%d\n",dd);
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return 0;
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}
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