45 lines
882 B
C++
45 lines
882 B
C++
#include<cstring>
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#include<cstdio>
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#include<cstdlib>
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using namespace std;
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int const maxn=122;
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int n,m;
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bool mat[maxn][maxn];
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bool vis[maxn];
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int mac[maxn];
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bool match(int x)
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{
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for(int i=1;i<=m;i++)
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{
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if(mat[x][i]&&!vis[i]){
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vis[i]=1;
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if(!mac[i]||match(mac[i])){
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mac[i]=x;
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return 1;
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}
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}
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}
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return 0;
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}
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int main(){
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int a,b;
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int test;
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scanf("%d",&test);
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while(test--){
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scanf("%d%d",&m,&n);
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memset(mat,0,sizeof(mat));
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memset(mac,0,sizeof(mac));
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for(int i=0;i<n;i++){
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scanf("%d%d",&a,&b);
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mat[a][b]=1;
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}
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int ans=0;
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for(int i=1;i<=m;i++){
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memset(vis,0,sizeof(vis));
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if(match(i))ans++;
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}
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printf("%d\n",m-ans);
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}
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return 0;
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}
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