제출 #847693

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
847693		TheMiraiTraveller0711	봉쇄 시간 (IOI23_closing)	C++17	8 / 100	168 ms	251108 KiB

closing

#include "closing.h"
#include <bits/stdc++.h>
// #include <vector>
using namespace std;
using ll = long long;

// Subtask Checker
class CheckSub1
{
private:
    vector<vector<pair<int, ll>>> adj;
    vector<bool> vis;
    vector<ll> dist;

    void DFS(int u, ll dd)
    {
        vis[u] = 1;
        dist[u] = dd;
        for (auto [v, w] : adj[u])
        {
            if (vis[v])
                continue;
            DFS(v, dd + w);
        }
    }

public:
    bool isSub1(int N, int X, int Y, long long K,
                vector<int> U, vector<int> V, vector<int> W)
    {
        adj.resize(N + 3);
        dist.resize(N + 3);
        vis.assign(N + 3, 0);
        for (int i = 0; i < N - 1; i++)
        {
            adj[U[i]].push_back({V[i], W[i]});
            adj[V[i]].push_back({U[i], W[i]});
        }
        DFS(X, 0);
        return (dist[Y] > 2 * K);
    }
};

/*
Subtask 1 :
*/
class Subtask1
{
private:
    vector<vector<pair<int, ll>>> adj;
    vector<bool> vis;
    void DFS(int u, ll dd, vector<ll> &dist)
    {
        vis[u] = 1;
        dist[u] = dd;
        for (auto [v, w] : adj[u])
        {
            if (vis[v])
                continue;
            DFS(v, dd + w, dist);
        }
    }

public:
    int getsol(int N, int X, int Y, long long K,
               vector<int> U, vector<int> V, vector<int> W)
    {
        adj.resize(N + 3);
        for (int i = 0; i < N - 1; i++)
        {
            adj[U[i]].push_back({V[i], W[i]});
            adj[V[i]].push_back({U[i], W[i]});
        }
        vector<ll> dist1(N + 3);
        vis.assign(N + 3, 0);
        DFS(X, 0, dist1);
        vector<ll> dist2(N + 3);
        vis.assign(N + 3, 0);
        DFS(Y, 0, dist2);

        vector<ll> adist;
        for (int i = 0; i < N; i++)
        {
            adist.push_back(dist1[i]);
            adist.push_back(dist2[i]);
        }
        sort(adist.begin(), adist.end());

        int pt = 0, ans = 0;
        ll cost = 0;
        while (pt < adist.size() && cost + adist[pt] <= K)
        {
            cost += adist[pt];
            pt++, ans++;
        }
        return ans;
    }
};

// Subtask2-8
class Subtask2
{
private:
    vector<vector<pair<int, ll>>> adj;
    vector<bool> vis;
    void DFS(int u, ll dd, vector<ll> &dist, vector<int> &trace)
    {
        vis[u] = 1;
        dist[u] = dd;
        for (auto [v, w] : adj[u])
        {
            if (vis[v])
                continue;
            trace[v] = u;
            DFS(v, dd + w, dist, trace);
        }
    }

public:
    int getsol(int N, int X, int Y, long long K,
               vector<int> U, vector<int> V, vector<int> W)
    {
        adj.resize(N + 3);
        for (int i = 0; i < N - 1; i++)
        {
            adj[U[i]].push_back({V[i], W[i]});
            adj[V[i]].push_back({U[i], W[i]});
        }

        if (X > Y)
            swap(X, Y);
        vector<ll> dist1(N + 3);
        vector<int> trace1(N + 3);
        vis.assign(N + 3, 0);
        DFS(X, 0, dist1, trace1);
        vector<ll> dist2(N + 3);
        vector<int> trace2(N + 3);
        vis.assign(N + 3, 0);
        DFS(Y, 0, dist2, trace2);

        Subtask1 solver;
        ll ans = solver.getsol(N, X, Y, K, U, V, W);

        vector<bool> pth(N + 3, 0);
        int gg = Y;
        while (gg != X)
        {
            pth[gg] = 1;
            gg = trace1[gg];
        }

        vector<vector<ll>> dp(4000, vector<ll>(8000, 1e18));
        dp[0][0] = 0;
        for (int i = 0; i < N; i++)
            for (int j = 0; j <= i * 2; j++)
            {
                if (pth[i])
                    dp[i + 1][j] = min(dp[i + 1][j], dp[i][j]);
                dp[i + 1][j + 1] = min(dp[i + 1][j + 1], dp[i][j] + min(dist1[i], dist2[i]));
                dp[i + 1][j + 2] = min(dp[i + 1][j + 2], dp[i][j] + max(dist1[i], dist2[i]));
            }

        for (int i = 0; i < 2 * N; i++)
        {
            if (dp[N][i] <= K)
                ans = max(ans, (ll)(i));
        }

        return ans;
    }
};

int max_score(int N, int X, int Y, long long K,
              std::vector<int> U, std::vector<int> V, std::vector<int> W)
{
    CheckSub1 check;
    bool isSub1 = check.isSub1(N, X, Y, K, U, V, W);
    if (isSub1)
    {
        Subtask1 sub1;
        return sub1.getsol(N, X, Y, K, U, V, W);
    }
    else if (N <= 3000 && !isSub1)
    {
        Subtask2 sub2;
        return sub2.getsol(N, X, Y, K, U, V, W);
    }
}

컴파일 시 표준 에러 (stderr) 메시지

closing.cpp: In member function 'int Subtask1::getsol(int, int, int, long long int, std::vector<int>, std::vector<int>, std::vector<int>)':
closing.cpp:91:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   91 |         while (pt < adist.size() && cost + adist[pt] <= K)
      |                ~~~^~~~~~~~~~~~~~
closing.cpp: In function 'int max_score(int, int, int, long long int, std::vector<int>, std::vector<int>, std::vector<int>)':
closing.cpp:176:15: warning: control reaches end of non-void function [-Wreturn-type]
  176 |     CheckSub1 check;
      |               ^~~~~

• Subtask 0: 0 / 0
• Subtask 1: 8 / 8
• Subtask 2: 0 / 9
• Subtask 3: 0 / 12
• Subtask 4: 0 / 14
• Subtask 5: 0 / 9
• Subtask 6: 0 / 11
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 17