85 lines
1.5 KiB
C++
85 lines
1.5 KiB
C++
#include<iostream>
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#include<string.h>
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using namespace std;
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int n,m;
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int cnt=0;
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typedef struct e{
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int data;
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e *next;
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}e;
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e edge[401];
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int v[401];
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int a[402],b[402];
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int dp[402][402];
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void dfs(int s){
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v[s]=1;
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if(s<=n)
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a[cnt]++;
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else
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b[cnt]++;
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e *p=edge[s].next;
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while(p){
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if(!v[p->data])
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dfs(p->data);
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p=p->next;
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}
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}
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void solve(){
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int i,j,k;
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memset(dp,0,sizeof(dp));
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dp[0][0]=1;
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for(k=1;k<=cnt;k++)
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for(i=n/2;i>=a[k];i--)
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for(j=n/2;j>=b[k];j--)
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dp[i][j]=dp[i][j]||dp[i-a[k]][j-b[k]];
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for(i=n/2;i>=0;i--)
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if(dp[i][i])
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break;
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cout<<i<<endl;
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}
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void bfs(){
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int i,j,k;
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cnt=0;
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memset(v,0,sizeof(v));
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memset(a,0,sizeof(a));
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memset(b,0,sizeof(b));
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for(i=1;i<=2*n;i++)
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if(v[i]==0)
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{
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cnt++;
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dfs(i);
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}
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}
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void read(){
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int i,j,k,s,t;
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int K;
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cin>>K;
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while(K--)
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{
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cin>>n>>m;
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for(i=1;i<=2*n;i++)
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{
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edge[i].data=i;
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edge[i].next=0;
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}
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for(i=1;i<=m;i++)
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{
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cin>>j>>k;
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e *p=new e;
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p->data=k+n;
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p->next=edge[j].next;
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edge[j].next=p;
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e *q=new e;
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q->data=j;
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q->next=edge[k+n].next;
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edge[k+n].next=q;
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}
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bfs();
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solve();
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}
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}
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int main(){
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read();
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return 0;
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}
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