제출 #1285775

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1285775		tdkhai	Village (BOI20_village)	C++20	0 / 100	1 ms	12088 KiB

Village

/*
        _.-- ,.--.
      .'   .'     /
       @       |'..--------._
     /      \._/              '.
    /  .-.-                     \
   (  /    \                     \
   \\      '.                  | #
    \\       \   -.           /
     :\       |    )._____.'   \
      "       |   /  \  |  \    )
              |   |./'  :__ \.-'
              '--'
*/
#include<bits/stdc++.h>
#define ll long long
#define llll pair<ll,ll>
#define ii pair<int,int>
#define fi first
#define se second
#define FOR(i,l,r) for(int i=l;i<=r;i++)
#define FOD(i,r,l) for(int i=r;i>=l;i--)
#define ull unsigned long long
#define iii pair<int,ii>
#define iv pair<pii,ii>
#define db double
#define ld long double
#define pb push_back
#define tdk "kfph"


using namespace std;

const int dx[]  = {1, -1, 0, 0};
const int dy[]  = {0, 0, -1, 1};
const int dxx[] = {1, 1, -1, -1, 2, 2, -2, -2};
const int dyy[] = {2, -2, 2, -2, 1, -1, 1, -1};
const ll INF=1e18;
const int N=1e5+5;
vector<int> a,g[N];
int n;


ll res;
int ans[N],sz[N],cen;
void dfs(int u,int par)
{
    sz[u]=1;
    for(int v:g[u])
    {
        if(v!=par)
        {
            dfs(v,u);
            sz[u]+=sz[v];
        }
    }
}
int findc(int u,int par)
{
    for(int v:g[u])
    {
        if(sz[v]*2>sz[1] and v!=par)
        {
            return findc(v,u);
        }
    }
    return u;
}
void caldis(int u,int par,int h)
{
    res+=h*2;
    a.pb(u);
    for(int v:g[u])
    {
        if(v!=par) caldis(v,u,h+1);
    }
}
void kfph()
{
    cin >> n;
    for(int i=1;i<n;i++)
    {
        int u,v;
        cin >> u >> v;
        g[u].pb(v);
        g[v].pb(u);
    }
    dfs(1,-1);
    cen=findc(1,-1);
    caldis(cen,-1,0);
    for(int i=0;i<n;i++)
    {
        ans[a[i]-1]=a[(i+n/2)%n];
    }
    cout << res<< '\n';
    for(int i=0;i<n;i++)
    {
        cout << ans[i] << ' ';
    }
}
int main()
{
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    if(fopen(tdk".inp","r"))
    {
        freopen(tdk".inp","r",stdin);
        freopen(tdk".out","w",stdout);
    }
    int t=1;
    //cin >> t;
    while(t--)
    {
        kfph();
    }
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

Village.cpp: In function 'int main()':
Village.cpp:106:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  106 |         freopen(tdk".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~
Village.cpp:107:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  107 |         freopen(tdk".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 12
• Subtask 2: 0 / 38
• Subtask 3: 0 / 50