제출 #1277350

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1277350		sasde	수도 (JOI20_capital_city)	C++20	11 / 100	3095 ms	59708 KiB

capital_city

#include<bits/stdc++.h>
using namespace std;
bool M1;
#define PI 3.14159265358979323846
#define sz(a) (int)a.size()
#define all(x) x.begin(),x.end()
#define ii pair<int,int>
#define iii pair<int,ii>
#define iv pair<ii,ii>
#define se second
#define fi first
#define ffi fi.fi
#define sfi se.fi
#define sse se.se
#define fse fi.se
#define lt(i, c, d) for(int i = c; i <= d; ++i)
#define fl(i, c, d) for(int i = d; i >= c; --i)
#define pb push_back
#define emb emplace_back
#define emf emplace_front
#define em emplace
#define look_memory cerr<<abs(&M2-&M1)/1024.0/1024<<'\n'
#define look_time   cerr << "TIME : " << clock() * 0.001 << "s" <<'\n'
const int N=1e6+5,lg=30,mod=1e9+7;
mt19937 rd(chrono::steady_clock::now().time_since_epoch().count());
int Rand(int u,int v){
 return u+rd()%(v-u+1);
}
int dx[]={1,0,-1,0,1,1,-1,-1};
int dy[]={0,-1,0,1,1,-1,1,-1};
int node,k,C[N],ans=1e9,query,edge,up[N][lg+5],h[N],tin[N],tout[N],timer;
vector<int>ver[N],mau[N];
void dfs(int u,int cha)
{
    tin[u]=++timer;
    for(auto v:ver[u])
    {
        if(v==cha)continue;
        up[v][0]=u;
        h[v]=h[u]+1;
        dfs(v,u);
    }
    tout[u]=timer;
}

int lca(int u,int v)
{
    if(h[u]<h[v])swap(u,v);
    for(int j=lg;j>=0;--j)
       {
        if(h[u]-h[v]>=(1<<j))
            u=up[u][j];
       }
     if(u==v)return u;
     for(int j=lg;j>=0;--j)
     {
        if(up[u][j]!=up[v][j])
        {
            u=up[u][j];
            v=up[v][j];
        }
     }
    return up[u][0];
}

void build(){
    dfs(1,-1);
    for(int j=1;j<=lg;++j)
    for(int i=1;i<=node;++i)up[i][j]=up[up[i][j-1]][j-1];
}
bool check[N];
void giai(int st){
    for(int i=1;i<=k;++i)check[i]=false;
    check[st]=true;
    queue<int>p;
    p.em(st);
    int res=0;
    while(!p.empty()){
        int x=p.front();
        ++res;
        p.pop();
        for(int i=0;i<sz(mau[x]);++i){
            int u=mau[x][i],v=mau[x][(i+1)%sz(mau[x])];
            int l=lca(u,v);
            while(u!=l){
                if(!check[C[u]]){
                    p.em(C[u]);
                    check[C[u]]=true;
                }
                u=up[u][0];
            }
            while(v!=l){
                if(!check[C[v]]){
                    p.em(C[v]);
                    check[C[v]]=true;
                }
                v=up[v][0];
            }
            if(!check[C[l]]){
                p.em(C[l]);
                check[C[l]]=true;
            }
        }
    }
    ans=min(ans,res-1);
}
bool M2;
void solve(){
    cin >> node >> k;
    for(int i=1;i<node;++i){
        int u,v;
        cin >> u >> v;
        ver[u].emb(v);
        ver[v].emb(u);
    }
    build();
    for(int i=1;i<=node;++i){
        cin >> C[i];
        mau[C[i]].emb(i);
    }
    for(int i=1;i<=k;++i)sort(all(mau[i]));
    for(int i=1;i<=k;++i){
        giai(i);
    }

    cout << ans;


}
main()
{
  srand(time(0));
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    #define task "aws"
    if(fopen(task".inp","r")){
      freopen(task".inp","r",stdin);
      freopen(task".out","w",stdout);
    }
    int t=1;
 //   cin >> t;
while(t--){
    solve();cout<<'\n';
}
look_memory;
look_time;
}

컴파일 시 표준 에러 (stderr) 메시지

capital_city.cpp:130:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
  130 | main()
      | ^~~~
capital_city.cpp: In function 'int main()':
capital_city.cpp:138:14: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  138 |       freopen(task".inp","r",stdin);
      |       ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
capital_city.cpp:139:14: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  139 |       freopen(task".out","w",stdout);
      |       ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 1 / 1
• Subtask 2: 10 / 10
• Subtask 3: 0 / 30
• Subtask 4: 0 / 59