56 lines
1.1 KiB
C++
56 lines
1.1 KiB
C++
#include<stdio.h>
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#include<math.h>
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#include<string.h>
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#include<algorithm>
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#include<vector>
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#include<queue>
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#include<set>
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using namespace std;
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int x,y;
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vector<int>v[10004];
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set<int>s[2];
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int dfs(int p,int b)
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{
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s[b].insert(p);
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int l=v[p].size();
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for(int i=0;i<l;i++)
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if(!s[!b].count(v[p][i]))
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dfs(v[p][i],!b);
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}
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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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while(T--)
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{
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scanf("%d%d",&x,&y);
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for(int i=0;i<y;i++)
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{
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int tx,ty;
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scanf("%d%d",&tx,&ty);
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v[tx].push_back(ty);
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v[ty].push_back(tx);
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}
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s[0].clear();
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s[1].clear();
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for(int i=0;i<x;i++)
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if(v[i].size())
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{
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dfs(i,0);
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break;
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}
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long long line;
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long long mmax=(s[0].size(),s[1].size());
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if(mmax<(x/2))
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{
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line=(x/2)*(x-x/2)-y;
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}
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else
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line=(x-mmax)*(x-(x-mmax))-y;
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printf("%I64d\n",line);
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for(int i=0;i<=x;i++)
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v[i].clear();
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}
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return 0;
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}
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