造数据

无向图

#include<bits/stdc++.h>
#define for1(i,a,b) for( int i=(a);i<=(b);i++)
#define for2(i,a,b) for( int i=(a);i<(b);i++)
#define for3(i,a,b) for( int i=(a);i>=(b);i--)
#define for4(i,a,b) for( int i=(a);i>(b);i--)
#define mx(a,b) max(a,b)
#define mn(a,b) min(a,b)
#define puba push_back
#define mem(a) memset((a),0,sizeof((a)))
using namespace std;
int x,y;
int rd(int l,int r){
    mt19937 rnd(random_device{}());
    return rnd()%(r-l+1)+l;
}
struct node{
    int l,r;
    bool operator < (const node &g) const{
        if(l==g.l) return r<g.r;
        return l<g.l;
    }
};
map<node,int>mp;
int main(){
    ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
	freopen("make.in","w",stdout);
    srand(time(0));
	int n=5,m=10,k=rd(1,n/2);
    cout<<n<<" "<<m<<"\n";
    for1(i,2,n){
        cout<<(x=rd(1,i-1))<<" "<<(y=i)<<"\n";
        mp[{x,y}]=mp[{y,x}]=1;
    }
    for1(i,n,m){
        x=rd(1,n),y=rd(1,n);
        while(mp[{x,y}]||(x==y)){
            x=rd(1,n),y=rd(1,n);
        }
        mp[{x,y}]=mp[{y,x}]=1;
        cout<<x<<" "<<y<<"\n";
    }
	
	return 0;
}