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Submission #980325

# Submission time Handle Problem Language Result Execution time Memory
980325 2024-05-12T05:04:53 Z vjudge1 Longest Trip (IOI23_longesttrip) C++17
15 / 100
 13 ms 1184 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);
}

void randomiza(linea &A, linea &B, linea &C) {
    vector <linea> vv;
    vv.push_back(A);
    vv.push_back(B);
    vv.push_back(C);
    shuffle(vv.begin(), vv.end(), rnd);
    A = vv[0];
    B = vv[1];
    C = vv[2];
    return;
}

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();
        randomiza(A, B, C);
        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);
        }
    }

    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;
                }
            }
        }
        return ans;
    }
    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:170:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  170 |         for (int i = 0; i < VA.size() - 1; i++) {
      |                         ~~^~~~~~~~~~~~~~~
longesttrip.cpp:174:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  174 |         for (int i = 0; i < VB.size() - 1; i++) {
      |                         ~~^~~~~~~~~~~~~~~

Subtask #0
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 3 ms 600 KB Output is correct

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 600 KB Output is correct
2 Correct 9 ms 344 KB Output is correct
3 Correct 8 ms 344 KB Output is correct
4 Correct 7 ms 600 KB Output is correct
5 Correct 8 ms 856 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 344 KB Output is correct
2 Correct 7 ms 496 KB Output is correct
3 Correct 8 ms 344 KB Output is correct
4 Correct 7 ms 344 KB Output is correct
5 Correct 9 ms 864 KB Output is correct
6 Correct 13 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 7 ms 548 KB Output is correct
10 Correct 9 ms 680 KB Output is correct
11 Correct 7 ms 856 KB Output is correct
12 Correct 7 ms 940 KB Output is correct
13 Correct 7 ms 856 KB Output is correct

Subtask #3
0.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 344 KB Output is correct
2 Correct 8 ms 344 KB Output is correct
3 Correct 9 ms 600 KB Output is correct
4 Correct 8 ms 600 KB Output is correct
5 Correct 7 ms 940 KB Output is correct
6 Correct 10 ms 344 KB Output is correct
7 Correct 9 ms 344 KB Output is correct
8 Correct 7 ms 600 KB Output is correct
9 Correct 7 ms 344 KB Output is correct
10 Correct 7 ms 696 KB Output is correct
11 Correct 6 ms 856 KB Output is correct
12 Correct 8 ms 1184 KB Output is correct
13 Correct 8 ms 684 KB Output is correct
14 Correct 7 ms 344 KB Output is correct
15 Correct 9 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

# Verdict Execution time Memory Grader output
1 Correct 9 ms 344 KB Output is correct
2 Correct 7 ms 344 KB Output is correct
3 Correct 7 ms 344 KB Output is correct
4 Correct 7 ms 600 KB Output is correct
5 Correct 6 ms 932 KB Output is correct
6 Correct 8 ms 344 KB Output is correct
7 Correct 8 ms 344 KB Output is correct
8 Correct 7 ms 600 KB Output is correct
9 Correct 7 ms 344 KB Output is correct
10 Correct 7 ms 1112 KB Output is correct
11 Correct 7 ms 856 KB Output is correct
12 Correct 7 ms 672 KB Output is correct
13 Correct 7 ms 856 KB Output is correct
14 Correct 7 ms 344 KB Output is correct
15 Correct 11 ms 344 KB Output is correct
16 Incorrect 3 ms 344 KB Incorrect
17 Halted 0 ms 0 KB -