1106D-Lunar_New_Year_and_a_Wander.cpp

/*
    written by Pankaj Kumar.
    country:-INDIA
*/
#include <bits/stdc++.h>
using namespace std;
typedef long long ll ;
typedef vector<ll> vl;
typedef vector<bool> vb;
typedef vector<char> vc;
typedef map<ll,ll> ml;
typedef set<char>sc;
typedef set<ll> sl;
#define pan cin.tie(0);cout.tie(0);ios_base::sync_with_stdio(0);
// define values.
// #define mod 1000000007
#define phi 1.618
/* Bit-Stuff */
#define get_set_bits(a) (__builtin_popcount(a))
#define get_set_bitsll(a) ( __builtin_popcountll(a))
#define get_trail_zero(a) (__builtin_ctz(a))
#define get_lead_zero(a) (__builtin_clz(a))
#define get_parity(a) (__builtin_parity(a))
/*  Abbrevations  */
#define ff first
#define ss second
#define mp make_pair
#define line cout<<endl;
#define pb push_back
#define Endl "\n"
// loops
#define forin(arr,n) for(ll i=0;i<n;i++) cin>>arr[i];
// Some print
#define no cout<<"NO"<<endl;
#define yes cout<<"YES"<<endl;
#define cc ll test;cin>>test;while(test--)
// sort
#define all(V) (V).begin(),(V).end()
#define srt(V) sort(all(V))
#define srtGreat(V) sort(all(V),greater<ll>())
// function

ll power(ll x,ll y,ll mod)
{
    ll res=1;
    // x=x%mod;
    while(y>0)
    {
        if(y%2==1)
        {
            res*=x;
            // res=res%mod;
        }
        y/=2; x*=x; // x=x%mod;
    }
    return res;
}
/* ascii value 
A=65,Z=90,a=97,z=122
*/
/*  -----------------------------------------------------------------------------------*/
ll n,m;
const int max_=1e5+5;
vector<ll> grp[max_];
vector<bool>check(max_,false);
priority_queue<ll,vector<ll>,greater<ll>> Q;


ll solve()
{
    cin>>n>>m;
    for(ll i=0;i<m;i++)
    {
        ll a,b;
        cin>>a>>b;
        grp[a].pb(b);
        grp[b].pb(a);
    }
    check[1]=true;
    Q.push(1);
    while(!Q.empty())
    {
        ll temp=Q.top();
        Q.pop();
        cout<<temp<<" ";
        for(auto x:grp[temp])
        {
            if(check[x]==false)
            {
                Q.push(x);
                check[x]=true;
            }
        } 
    }
    line;
    return 0;
}

int main()
{
    //freopen("input.txt"a, "r", stdin);
    pan;
    solve();
    // cc
    // {
    //     solve();
    // }
    return 0;
}