제출 #1038406

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1038406		vjudge1	Spring cleaning (CEOI20_cleaning)	C++17	0 / 100	1096 ms	15840 KiB

cleaning

#include <bits/stdc++.h>
#pragma GCC optimize("Ofast")
#pragma GCC target("avx2")
#pragma GCC optimization ("O3")
#pragma GCC optimization ("unroll-loops")
#pragma GCC target("popcnt")
using namespace std;

using ll = long long;
using ull = unsigned long long;
using lld = long double;
using vi = vector<int>;
using vll = vector<ll>;
using ii = pair<int,int>;
using pll = pair<ll, ll>;
using vii = vector<ii>;
using vpll = vector<pll>;

#define endl '\n'
#define all(x) x.begin(),x.end()
#define lsb(x) x&(-x)
#define gcd(a,b) __gcd(a,b)
#define sz(x) (int)x.size()
#define mp make_pair
#define pb push_back
#define fi first
#define se second
#define fls cout.flush()

#define fore(i,l,r) for(auto i=l;i<r;i++)
#define fo(i,n) fore(i,0,n)
#define forex(i,r,l) for(auto i=r; i>=l;i--)
#define ffo(i,n) forex(i,n-1,0)

bool cmin(int &a, int b){if(b<a){a=b;return 1;}return 0;}
bool cmax(int &a, int b){if(b>a){a=b;return 1;}return 0;}
void valid(ll in){cout<<((in)?"YES\n":"NO\n");}
ll lcm(ll a, ll b){return (a/gcd(a,b))*b;}
ll gauss(ll n){return (n*(n+1))/2;}
const int N = 1e5 + 7, LOG=20;
vi graph[N];
int r=0,tin[N],timer=0, up[N][LOG], ni[N];
void dfs(int u,int p=0){
    tin[u]=timer++;
    up[u][0]=p;
    fore(i,1,LOG)up[u][i]=up[up[u][i-1]][i-1];
    for(int v:graph[u]){
        if(v==p)continue;
        ni[v]=ni[u]+1;
        dfs(v, u);
    }
}
bool ord(int i, int j){
    return tin[i]<tin[j];
}
int LCA(int u,int v){
    if(ni[u]>ni[v])swap(u,v);
    ffo(i,LOG)if((ni[v]-ni[u])&(1<<i))v=up[v][i];
    ffo(i,LOG)if(up[u][i]!=up[v][i])u=up[u][i],v=up[v][i];
    return (u==v?u:up[u][0]);
}
int dis(int u, int v){
    return ni[u]+ni[v]-2*ni[LCA(u,v)];
}
void test_case(){
    int n,q;
    cin>>n>>q;
    fo(i,n-1){
        int a,b;
        cin>>a>>b;
        graph[a].pb(b);
        graph[b].pb(a);
    }
    fore(i,1,n+1)if(sz(graph[i])>1)r=i;
    while(q--){
        timer=0;
        int k;
        cin>>k;
        vi u(k);
        int x=n;
        fo(i,k){
            cin>>u[i];
            graph[u[i]].pb(++x);
            graph[x].pb(u[i]);
        }
        dfs(r);
        vi leaves;
        fore(i,1,x+1)if(sz(graph[i])==1)leaves.pb(i);
        if(sz(leaves)&1){
            cout<<-1<<endl;
        }else{
            sort(all(leaves), ord);
            int ans=0;
            for(int i=1;i<sz(leaves)-1;i+=2)ans+=dis(leaves[i], leaves[i+1]);
            ans+=dis(leaves[0],leaves.back());
            cout<<ans<<endl;
        }
        fo(i,k)graph[u[i]].pop_back();
        fore(i,n+1,x+1)graph[i].pop_back();
    }
}
int main(){cin.tie(0)->sync_with_stdio(0);
    int t=1;
    // cin >> t;
    while(t--)test_case();
}

컴파일 시 표준 에러 (stderr) 메시지

cleaning.cpp:4: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
    4 | #pragma GCC optimization ("O3")
      | 
cleaning.cpp:5: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
    5 | #pragma GCC optimization ("unroll-loops")
      |

• Subtask 1: 0 / 0
• Subtask 2: 0 / 9
• Subtask 3: 0 / 9
• Subtask 4: 0 / 16
• Subtask 5: 0 / 19
• Subtask 6: 0 / 17
• Subtask 7: 0 / 30