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답안 #980321

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
980321 2024-05-12T05:00:15 Z vjudge1 가장 긴 여행 (IOI23_longesttrip) C++17
15 / 100
 16 ms 1116 KB 
#include "longesttrip.h"
#include <bits/stdc++.h>

#include <vector>
#define MP make_pair
#define f first
#define s second
#define mid ((l+r)>>1)
typedef long long ll;
using namespace std;

mt19937_64 rnd(23);

const int INF = (int)1e6;

vector <int> auxa,auxb;

bool conectados(int A, int B) {
    auxa.clear(); auxb.clear();
    auxa.push_back(A);
    auxb.push_back(B);
    return are_connected(auxa,auxb);
}

struct linea{
    deque <int> lin;
    linea(){}
    linea(int A) {
        lin.push_front(A);
    }
    void unir(linea &B, int NB, int NA) {
        if (NA == lin.front() && NB == B.lin.front()) {
            while (!B.lin.empty()) {
                lin.push_front(B.lin.front());
                B.lin.pop_front();
            }
            return;
        }
        if (NA == lin.front() && NB == B.lin.back()) {
            while (!B.lin.empty()) {
                lin.push_front(B.lin.back());
                B.lin.pop_back();
            }
            return;
        }
        if (NA == lin.back() && NB == B.lin.front()) {
            while (!B.lin.empty()) {
                lin.push_back(B.lin.front());
                B.lin.pop_front();
            }
            return;
        }
        if (NA == lin.back() && NB == B.lin.back()) {
            while (!B.lin.empty()) {
                lin.push_back(B.lin.back());
                B.lin.pop_back();
            }
            return;
        }
        return;
    }
};

vector <int> caso_base(int N) {
    auxa.clear();
    auxa.push_back(0);
    if (conectados(0, 1)) auxa.push_back(1);
    return auxa;
}

void dfs(int nodo, vector <bool> &vis, vector <vector<int>> &g, vector <int> &ans, int anc1, int anc2) {
    ans.push_back(nodo);
    if (ans.size() > 1) {
        anc1 = -1;
        anc2 = -1;
    }
    vis[nodo] = true;
    for (auto &it : g[nodo]) {
        if (vis[it] || it == anc1 || it == anc2) continue;
        dfs(it, vis, g, ans, anc1, anc2);
    }
    return;
}

int bin(int l, int r, vector <int> &ar, vector <int> &bus) {
    if (l == r) return ar[l];
    auxa.clear();
    for (int i = l; i <= mid; i++) auxa.push_back(ar[i]);
    if (are_connected(auxa, bus)) return bin(l, mid, ar, bus);
    else return bin(mid + 1, r, ar, bus);
}

std::vector<int> longest_trip(int N, int D) {
    if (N <= 2) return caso_base(N);
    vector <linea> V;
    vector <int> ans;
    for (int i = 0; i < N; i++)
        V.push_back(linea(i));
    shuffle(V.begin(),V.end(),rnd);
    while (V.size() >= 3) {
        linea A = V.back();
        V.pop_back();
        linea B = V.back();
        V.pop_back();
        linea C = V.back();
        V.pop_back();
        if (conectados(A.lin.front(), B.lin.front())) {
            A.unir(B, B.lin.front(), A.lin.front());
            V.push_back(A);
            V.push_back(C);
        }
        else if (conectados(A.lin.front(), C.lin.front())) {
            A.unir(C, C.lin.front(), A.lin.front());
            V.push_back(A);
            V.push_back(B);
        }
        else {
            B.unir(C, C.lin.front(), B.lin.front());
            V.push_back(B);
            V.push_back(A);
        }
        shuffle(V.begin(),V.end(),rnd);
    }

    linea A = V[0], B = V[1];
    vector <int> VA, VB;
    while (!V[1].lin.empty()) {
        VB.push_back(V[1].lin.front());
        V[1].lin.pop_front();
    }
    while (!V[0].lin.empty()) {
        VA.push_back(V[0].lin.front());
        V[0].lin.pop_front();
    }

    if (!are_connected(VA,VB)) {
        if (VA.size() > VB.size()) return VA;
        return VB;
    }

    V[0] = A; V[1] = B;

    if (conectados(V[0].lin.front(), V[1].lin.front())) V[1].unir(V[0], V[0].lin.front(), V[1].lin.front());
    else if (conectados(V[0].lin.front(), V[1].lin.back())) V[1].unir(V[0], V[0].lin.front(), V[1].lin.back());
    else if (conectados(V[0].lin.back(), V[1].lin.back())) V[1].unir(V[0], V[0].lin.back(), V[1].lin.back());
    else if (conectados(V[0].lin.back(), V[1].lin.front())) V[1].unir(V[0], V[0].lin.back(), V[1].lin.front());
    else {
    int ancla = bin(0, VA.size() - 1, VA, VB);
    vector <int> vancla;
    vancla.push_back(ancla);
    int ancla2 = bin(0, VB.size() - 1, VB, vancla);

    vector <vector<int>> g(N + 2);
    vector <bool> vis(N + 2);
    for (int i = 0; i < N + 2; i++)
        vis[i] = false;

    for (int i = 0; i < VA.size() - 1; i++) {
        g[VA[i]].push_back(VA[i + 1]);
        g[VA[i + 1]].push_back(VA[i]);
    }
    for (int i = 0; i < VB.size() - 1; i++) {
        g[VB[i]].push_back(VB[i + 1]);
        g[VB[i + 1]].push_back(VB[i]);
    }
    g[VA[VA.size() - 1]].push_back(VA[0]);
    g[VA[0]].push_back(VA[VA.size() - 1]);

    g[VB[VB.size() - 1]].push_back(VB[0]);
    g[VB[0]].push_back(VB[VB.size() - 1]);

    g[ancla].push_back(ancla2);
    g[ancla2].push_back(ancla);

    if (VA.size() != 1) {
        for (auto &it : g[ancla]) {
            if (it != ancla2) {
                dfs(it, vis, g, ans, ancla, ancla2);
                break;
            }
        }
    }
    else {
        for (auto &it : g[ancla2]) {
            if (it != ancla) {
                dfs(it, vis, g, ans, ancla, ancla2);
                break;
            }
        }
    }
    }
    while (!V[1].lin.empty()) {
        ans.push_back(V[1].lin.front());
        V[1].lin.pop_front();
    }
    return ans;
}

Compilation message

longesttrip.cpp: In function 'std::vector<int> longest_trip(int, int)':
longesttrip.cpp:158:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  158 |     for (int i = 0; i < VA.size() - 1; i++) {
      |                     ~~^~~~~~~~~~~~~~~
longesttrip.cpp:162:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  162 |     for (int i = 0; i < VB.size() - 1; i++) {
      |                     ~~^~~~~~~~~~~~~~~

Subtask #0
0.0 / 0.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 4 ms 600 KB Output is correct

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 8 ms 344 KB Output is correct
2 Correct 7 ms 344 KB Output is correct
3 Correct 8 ms 604 KB Output is correct
4 Correct 10 ms 600 KB Output is correct
5 Correct 14 ms 688 KB Output is correct

Subtask #2
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 8 ms 344 KB Output is correct
2 Correct 6 ms 344 KB Output is correct
3 Correct 7 ms 608 KB Output is correct
4 Correct 10 ms 564 KB Output is correct
5 Correct 15 ms 684 KB Output is correct
6 Correct 9 ms 344 KB Output is correct
7 Correct 6 ms 344 KB Output is correct
8 Correct 8 ms 600 KB Output is correct
9 Correct 9 ms 556 KB Output is correct
10 Correct 14 ms 856 KB Output is correct
11 Correct 14 ms 1116 KB Output is correct
12 Correct 16 ms 852 KB Output is correct
13 Correct 13 ms 856 KB Output is correct

Subtask #3
0.0 / 25.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 344 KB Output is correct
2 Correct 7 ms 596 KB Output is correct
3 Correct 7 ms 596 KB Output is correct
4 Correct 9 ms 600 KB Output is correct
5 Correct 13 ms 688 KB Output is correct
6 Correct 8 ms 344 KB Output is correct
7 Correct 6 ms 344 KB Output is correct
8 Correct 7 ms 600 KB Output is correct
9 Correct 9 ms 600 KB Output is correct
10 Correct 15 ms 856 KB Output is correct
11 Correct 13 ms 932 KB Output is correct
12 Correct 15 ms 856 KB Output is correct
13 Correct 15 ms 680 KB Output is correct
14 Correct 6 ms 344 KB Output is correct
15 Correct 7 ms 344 KB Output is correct
16 Incorrect 2 ms 344 KB Incorrect
17 Halted 0 ms 0 KB -

Subtask #4
0.0 / 60.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 344 KB Output is correct
2 Correct 9 ms 344 KB Output is correct
3 Correct 8 ms 764 KB Output is correct
4 Correct 10 ms 568 KB Output is correct
5 Correct 15 ms 864 KB Output is correct
6 Correct 10 ms 344 KB Output is correct
7 Correct 7 ms 344 KB Output is correct
8 Correct 7 ms 600 KB Output is correct
9 Correct 9 ms 800 KB Output is correct
10 Correct 13 ms 680 KB Output is correct
11 Correct 14 ms 688 KB Output is correct
12 Correct 14 ms 864 KB Output is correct
13 Correct 16 ms 856 KB Output is correct
14 Correct 10 ms 344 KB Output is correct
15 Correct 8 ms 340 KB Output is correct
16 Incorrect 2 ms 340 KB Incorrect
17 Halted 0 ms 0 KB -