86 lines
1.6 KiB
C++
86 lines
1.6 KiB
C++
#include<cstdio>
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struct char_reader
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{
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FILE* f;
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char *buf,*p1,*p2;
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int size;
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char_reader(FILE* fin,int bufsize=100000)
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{
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f=fin;
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size=bufsize;
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p1=p2=0;
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buf=new char[bufsize];
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}
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inline int operator()()
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{
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return p1==p2&&(p2=(p1=buf)+fread(buf,1,size,f),p1==p2)?EOF:*p1++;
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}
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};
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struct char_writer
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{
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FILE* f;
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char *buf,*p,*end;
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char_writer(FILE* fout,int bufsize=100000)
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{
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f=fout;
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buf=new char[bufsize];
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p=buf;
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end=buf+bufsize;
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}
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~char_writer()
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{
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fwrite(buf,p-buf,1,f);
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}
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inline char operator()(char ch)
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{
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return end==p&&(fwrite(buf,end-buf,1,f),p=buf),*p++=ch;
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}
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};
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char_reader gch(stdin);
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char_writer wch(stdout);
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template<typename T> inline void read(T& t)
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{
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t=0; bool f=false; char ch;
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while(ch=gch(),!((ch>='0'&&ch<='9')||ch=='-'));
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if(ch=='-') f=true,ch=gch();
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t=ch-'0';
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while(ch=gch(),ch>='0'&&ch<='9') t=t*10+ch-'0';
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if(f) t=-t;
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}
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#if __cplusplus >= 201103L
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template<typename T,typename... Args> inline void read(T& t,Args&... args) { read(t); read(args...); }
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#endif
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#include<cstring>
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#include<algorithm>
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#include<map>
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using namespace std;
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int T,n,a[205],cnt;
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int main()
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{
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#ifdef local
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freopen("pro.in","r",stdin);
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#endif
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read(T);
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while(T-->0)
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{
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read(n);
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map<int,int> mp;
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for(int i=0;i<n*4;i++)
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{
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int x; read(x);
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mp[x]++;
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}
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cnt=0;
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for(auto v:mp)
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{
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if(v.second&1) { puts("NO"); goto ed; }
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for(int i=0;i<v.second/2;i++) a[cnt++]=v.first;
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}
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// printf("a: "); for(int i=0;i<cnt;i++) printf("%d ",a[i]); puts("");
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for(int i=1,j=cnt-2;i<j;i++,j--)
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if(a[i]*a[j]!=a[0]*a[cnt-1]) { puts("NO"); goto ed; }
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puts("YES");
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ed:;
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}
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return 0;
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} |