제출 #946392

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
946392		yeediot	수도 (JOI20_capital_city)	C++14	100 / 100	484 ms	45536 KiB

capital_city

#include<bits/stdc++.h>
using namespace std;
#define int long long
#define F first
#define S second
#define all(x) x.begin(),x.end()
#define pii pair<int,int>
#define pb push_back
#define sz(x) (int)(x.size())
#define chmin(x,y) x=min(x,y)
#define chmax(x,y) x=max(x,y)
#define vi vector<int>
#define vp vector<pii>
#define vvi vector<vi>
#define ykh mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count())
#define __lg(x) 63-__builtin_clzll(x)
#define pow2(x) (1LL<<x)
void __print(int x) {cerr << x;}
void __print(float x) {cerr << x;}
void __print(double x) {cerr << x;}
void __print(long double x) {cerr << x;}
void __print(char x) {cerr << '\'' << x << '\'';}
void __print(const char *x) {cerr << '\"' << x << '\"';}
void __print(const string &x) {cerr << '\"' << x << '\"';}
void __print(bool x) {cerr << (x ? "true" : "false");}

template<typename T, typename V>
void __print(const pair<T, V> &x) {cerr << '{'; __print(x.first); cerr << ','; __print(x.second); cerr << '}';}
template<typename T>
void __print(const T &x) {int f = 0; cerr << '{'; for (auto &i: x) cerr << (f++ ? "," : ""), __print(i); cerr << "}";}
void _print() {cerr << "]\n";}
template <typename T, typename... V>
void _print(T t, V... v) {__print(t); if (sizeof...(v)) cerr << ", "; _print(v...);}
#ifdef local
void setio(){freopen("/Users/iantsai/Library/Mobile Documents/com~apple~CloudDocs/cpp/Empty.md","r",stdin);}
#define debug(x...) cerr << "[" << #x << "] = ["; _print(x)
#else
void setio(){}
#define debug(x...)
#endif
void setIO(string s) {
    freopen((s + ".in").c_str(), "r", stdin);
    freopen((s + ".out").c_str(), "w", stdout);
}
struct line{
    int a,b;
    int operator()(const int x)const{
        return a*x+b;
    }
};
bool check(line l1,line l2,line l3){
    return (l3.b-l2.b)*(l1.a-l2.a)<=(l2.b-l1.b)*(l2.a-l3.a);
}
const int mxn=2e5+5;
vector<int>adj[mxn];
vector<int>g[mxn];
int c[mxn];
bool vis[mxn];
int cnt[mxn];
bool used[mxn];
bool in[mxn];
int p[mxn];
vector<int>sir;
void cnt_sz(int v,int pa){
    cnt[v]=1;
    in[v]=1;
    sir.pb(v);
    for(auto u:adj[v]){
        if(u==pa or vis[u])continue;
        cnt_sz(u,v);
        cnt[v]+=cnt[u];
    }
}
int find(int v,int pa,int tar){
    for(auto u:adj[v]){
        if(vis[u] or u==pa)continue;
        if(cnt[u]*2>tar)return find(u,v,tar);
    }
    return v;
}
void calc_pa(int v,int pa){
    p[v]=pa;
    for(auto u:adj[v]){
        if(vis[u] or u==pa)continue;
        calc_pa(u,v);
    }
}
int ans;
void cen(int v){
    cnt_sz(v,v);
    v=find(v,v,cnt[v]);
    calc_pa(v,v);
    debug(v);
    vis[v]=1;
    queue<int>q;
    q.push(c[v]);
    used[c[v]]=1;
    vector<int>undo;
    undo.pb(c[v]);
    while(sz(q)){
        int color=q.front();
        q.pop();
        for(auto u:g[color]){
            if(!in[u]){
                goto done;
            }
            if(p[u]!=u and !used[c[p[u]]]){
                q.push(c[p[u]]);
                used[c[p[u]]]=1;
                undo.pb(c[p[u]]);
            }
        }
    }
    chmin(ans,sz(undo)-1);
    done:
    while(sz(undo)){
        used[undo.back()]=0;
        undo.pop_back();
    }
    while(sz(sir)){
        in[sir.back()]=0;
        sir.pop_back();
    }
    for(auto u:adj[v]){
        if(vis[u])continue;
        cen(u);
    }
}
signed main(){
    setio();
    ios::sync_with_stdio(0);
    cin.tie(0);cout.tie(0);
    int n,k;
    cin>>n>>k;
    for(int i=1;i<n;i++){
        int a,b;
        cin>>a>>b;
        adj[a].pb(b);
        adj[b].pb(a);
    }
    for(int i=1;i<=n;i++){
        cin>>c[i];
        g[c[i]].pb(i);
    }
    ans=k-1;
    cen(1);
    cout<<ans<<'\n';
}
 /*
 input:
 
 */















 

컴파일 시 표준 에러 (stderr) 메시지

capital_city.cpp: In function 'void setIO(std::string)':
capital_city.cpp:42:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   42 |     freopen((s + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
capital_city.cpp:43:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   43 |     freopen((s + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 1 / 1
• Subtask 2: 10 / 10
• Subtask 3: 30 / 30
• Subtask 4: 59 / 59