Submission #713397

#	Time	Username	Problem	Language	Result	Execution time	Memory
713397		ammar2000	Village (BOI20_village)	C++17	50 / 100	142 ms	19596 KiB

Village

#include<bits/stdc++.h>
#define ll long long
#define pb push_back
#define F first
#define S second
#define coy cout<<"YES\n"
#define con cout<<"NO\n"
#define co1 cout<<"-1\n"
#define sc(x) scanf("%lld",&x)
#define all(x) x.begin(),x.end()
#define fast ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
using namespace std;
const int SI=2e5+7;
ll INF=8e18+7;
int MOD=1e9+7;
int dx[] = {1 , -1 , 0 , 0};
int dy[] = {0 , 0 , 1 , -1};
int T=1;
ll ss;
ll n,dp[SI],up[SI],ans[SI];
vector < ll> v[SI];
void bt( int x=1,int pa=0)
{
     for (auto i:v[x])
     {
         if (i==pa)
            continue;
         bt(i,x);
         if (up[i]==0)
         {
             swap(ans[x],ans[i]);
             ss+=2;
             up[x]=1;
         }
     }
}
void solver()
{
    cin>>n;
    ans[n]=n;
    for (int i=1;i<n;i++)
    {
        ans[i]=i;
        int a,b;
        cin>>a>>b;
        v[a].pb(b);
        v[b].pb(a);
    }
    bt();
    if(ans[1]==1)
        ss+=2,swap(ans[1],ans[v[1].back()]);
    cout <<ss<<" 0\n";
    for (int i=1;i<=n;i++)
        cout <<ans[i]<<" ";
    for (int i=1;i<=n;i++)
        cout <<ans[i]<<" ";
}
int main()
{
   //fast
   while (T--)
     solver();
   return 0;
}

• Subtask 1: 6 / 12
• Subtask 2: 19 / 38
• Subtask 3: 25 / 50