제출 #1039623

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1039623		12345678	Inside information (BOI21_servers)	C++17	50 / 100	106 ms	37260 KiB

servers

#include <bits/stdc++.h>

using namespace std;

const int nx=250005, kx=18;

int n, k, a[nx], b[nx], cnt[nx], lvl[nx], pa[nx][kx], up[nx], dn[nx], pw[nx], t, in[nx], out[nx];
char opr[nx];
vector<pair<int, int>> d[nx];

void dfs(int u, int p)
{
    lvl[u]=lvl[p]+1;
    in[u]=++t;
    up[u]=p;
    if (pw[u]<pw[p]) up[u]=up[p];
    dn[u]=p;
    if (pw[u]>pw[p]) dn[u]=dn[p];
    pa[u][0]=p;
    for (int i=1; i<kx; i++) pa[u][i]=pa[pa[u][i-1]][i-1];
    for (auto [v, w]:d[u]) if (v!=p) pw[v]=w, dfs(v, u);
    out[u]=t;
}

pair<int, int> query1(int idx)
{
    if (in[a[idx]]<=in[b[idx]]&&in[b[idx]]<=out[a[idx]]) return {a[idx], 0};
    int tmp=a[idx];
    for (int i=kx-1; i>=0; i--) if (!(in[pa[tmp][i]]<=in[b[idx]]&&in[b[idx]]<=out[pa[tmp][i]])) tmp=pa[tmp][i];
    if (lvl[up[a[idx]]]>lvl[pa[tmp][0]]) return {-1, 0};
    return {pa[tmp][0], pw[tmp]};
}

int query(int i)
{
    auto [u, lst]=query1(i);
    if (u==-1) return 0;
    else
    {
        if (u==b[i]&&lst<=cnt[i]) return 1;
        else if (u==b[i]&&lst>cnt[i]) return 0;
        else
        {
            int vl=pw[b[i]], tmp=b[i];
            if (lvl[dn[b[i]]]>lvl[u]||pw[b[i]]>cnt[i]) return 0;
            else
            {
                for (int j=kx-1; j>=0; j--) if (lvl[pa[tmp][j]]>lvl[u]) tmp=pa[tmp][j];
                if (lst<pw[tmp]) return 1;
                else return 0;
            }
        }
    }
}

int main()
{
    cin.tie(NULL)->sync_with_stdio(false);
    cin>>n>>k;
    for (int i=1; i<n+k; i++)
    {
        cin>>opr[i];
        cnt[i]=cnt[i-1];
        if (opr[i]=='S') cin>>a[i]>>b[i], cnt[i]++, d[a[i]].push_back({b[i], cnt[i]}), d[b[i]].push_back({a[i], cnt[i]});
        if (opr[i]=='Q') cin>>b[i]>>a[i];
        if (opr[i]=='C') cin>>a[i];
    }
    dfs(1, 1);
    for (int i=1; i<n+k; i++)
    {
        if (opr[i]=='Q') cout<<(query(i)?"yes\n":"no\n");
        if (opr[i]=='C') cout<<0<<'\n';
    }
}

컴파일 시 표준 에러 (stderr) 메시지

servers.cpp: In function 'int query(int)':
servers.cpp:44:17: warning: unused variable 'vl' [-Wunused-variable]
   44 |             int vl=pw[b[i]], tmp=b[i];
      |                 ^~

• Subtask 1: 2.5 / 2.5
• Subtask 2: 0 / 2.5
• Subtask 3: 2.5 / 2.5
• Subtask 4: 0 / 2.5
• Subtask 5: 5 / 5
• Subtask 6: 0 / 5
• Subtask 7: 10 / 10
• Subtask 8: 0 / 10
• Subtask 9: 12.5 / 12.5
• Subtask 10: 0 / 12.5
• Subtask 11: 17.5 / 17.5
• Subtask 12: 0 / 17.5