23 lines
448 B
C++
23 lines
448 B
C++
#include<stdio.h>
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#include<string.h>
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int main()
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{
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int t,l,n,a[21][21],i,j,k,o;
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scanf("%d",&t);
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while(t--)
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{
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memset(a,0,sizeof(int)*21*21);
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k=0;
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scanf("%d%d",&l,&n);
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o=n;
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while(o--)
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{
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scanf("%d%d",&i,&j);
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if(a[i][j]==0) a[i][j]=1;
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else k++;
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}
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if((n-k)%4==0)printf("YES\n");
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else printf("NO\n");
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}
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}
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