Submission #839924

#	Time	Username	Problem	Language	Result	Execution time	Memory
839924		That_Salamander	Longest Trip (IOI23_longesttrip)	C++17	0 / 100	191 ms	848 KiB

longesttrip

#include <vector>

std::vector<int> longest_trip(int N, int D);

bool are_connected(std::vector<int> A, std::vector<int> B);

#include <bits/stdc++.h>

using namespace std;

typedef vector<int> vi;

int n;
bool adj[256][256];
vector<int> conn[256];

void makePath(vector<int>& nodes, vector<int>& out);

vector<int> secondary;
void makePaths(vector<int>& nodes, vector<int>& primary) {
    secondary.clear();
    if (nodes.size() <= 1) {
        for (int x: nodes) {
            primary.push_back(x);
        }
        return;
    }
    vi g1;
    vector<bool> mask(n, true);
    for (int x: nodes) {
        mask[x] = false;
    }

    queue<int> q;
    q.push(nodes[0]);

    while (!q.empty()) {
        auto t = q.front(); q.pop();
        if (mask[t]) continue;
        g1.push_back(t);
        mask[t] = true;

        for (int c: conn[t]) {
            q.push(c);
        }
    }

    if (g1.size() == nodes.size()) {
        makePath(nodes, primary);
        secondary.clear();
    } else {
        for (int x: g1) {
            primary.push_back(x);
        }
        for (int x: nodes) {
            if (!mask[x]) {
                secondary.push_back(x);
            }
        }
    }
}

#define MIDDLE 0
#define INTER 1
#define UPPER 2
#define LOWER 3

void makePath(vector<int>& nodes, vector<int>& res) {
    if (nodes.size() <= 2) {
        for (int x: nodes) {
            res.push_back(x);
        }
    }

    vector<int> nodeTypes(n, -1);

    int middleNode = nodes[0];
    nodeTypes[middleNode] = MIDDLE;

    vi lowerNodes, interNodes, upperNodes;

    for (int x: nodes) {
        if (nodeTypes[x] == -1 && !adj[x][middleNode]) {
            lowerNodes.push_back(x);
            nodeTypes[x] = LOWER;
        }
    }

    for (int x: nodes) {
        if (nodeTypes[x] != -1) continue;
        bool bruh = false;
        for (int y: lowerNodes) {
            if (adj[x][y]) {
                bruh = true;
                break;
            }
        }

        if (bruh) {
            interNodes.push_back(x);
            nodeTypes[x] = INTER;
        } else {
            upperNodes.push_back(x);
            nodeTypes[x] = UPPER;
        }
    }

    if (lowerNodes.size() == 0) {
        makePaths(upperNodes, res);

        res.push_back(middleNode);

        for (int x: secondary) {
            res.push_back(x);
        }
    } else if (lowerNodes.size() == 1) {
        for (int x: upperNodes) {
            res.push_back(x);
        }

        res.push_back(middleNode);

        makePaths(interNodes, res);

        res.push_back(lowerNodes[0]);

        for (int x: secondary) {
            res.push_back(x);
        }
    } else {
        for (int x: upperNodes) {
            res.push_back(x);
        }

        res.push_back(middleNode);

        makePaths(interNodes, res);

        int n1 = res.back();
        if (secondary.empty()) {
            int start;
            for (int x:lowerNodes) {
                if (adj[x][n1]) {
                    start = x;
                    break;
                }
            }

            res.push_back(start);

            for (int x:lowerNodes) {
                if (x != start) res.push_back(x);
            }
        } else {
            int n2 = secondary.front();

            int a, b;

            vector<int> a1, a2;

            for (int x: lowerNodes) {
                if (adj[n1][x]) {
                    a1.push_back(x);
                }

                if (adj[n2][x]) {
                    a2.push_back(x);
                }
            }

            if (a1.size() > 1 && a2.size() > 1) {
                a = a1[0];
                b = a2[0] == a ? a2[1] : a2[0];
            } else if (a2.size() > 1) {
                a = a1[0];
                b = a2[0] == a ? a2[1] : a2[0];
            } else if (a1.size() > 1) {
                b = a2[0];
                a = a1[0] == b ? a1[1] : a1[0];
            } else {
                a = a1[0];
                b = a2[0];
            }

            out:

            res.push_back(a);

            for (int x: lowerNodes) {
                if (x != a && x != b) {
                    res.push_back(x);
                }
            }

            res.push_back(b);

            for (int x: secondary) {
                res.push_back(x);
            }
        }
    }
}

/*
1
5 1
0
1 1
0 1 0
1 0 0 1
*/

vector<int> longest_trip(int N, int D) {
    n = N;
    memset(adj, false, sizeof(adj));
    for (int i = 0; i < N; i++) {
        conn[i].clear();
    }

    vi allNodes;

    for (int i = 0; i < N; i++) {
        allNodes.push_back(i);
        for (int j = i+1; j < N; j++) {
            if (are_connected({i}, {j})) {
                adj[i][j] = adj[j][i] = true;

                conn[i].push_back(j);
                conn[j].push_back(i);
            }
        }
    }

    vector<int> primary;
    makePaths(allNodes, primary);

    if (primary.size() > secondary.size()) {
        return primary;
    } else {
        return secondary;
    }
}

#ifdef BRUH
static inline constexpr int maxNumberOfCalls = 32640;
static inline constexpr int maxTotalNumberOfCalls = 150000;
static inline constexpr int maxTotalNumberOfLandmarksInCalls = 1500000;
static int call_counter = 0;
static int total_call_counter = 0;
static int landmark_counter = 0;

static int C, N, D;
static std::vector<std::vector<int>> U;
static std::vector<bool> present;

static inline void protocol_violation(std::string message)
{
    printf("Protocol Violation: %s\n", message.c_str());
    exit(0);
}

bool are_connected(std::vector<int> A, std::vector<int> B)
{
    ++call_counter;
    ++total_call_counter;
    if (call_counter > maxNumberOfCalls || total_call_counter > maxTotalNumberOfCalls)
    {
        protocol_violation("too many calls");
    }

    int nA = A.size(), nB = B.size();
    landmark_counter += nA + nB;
    if (landmark_counter > maxTotalNumberOfLandmarksInCalls)
    {
        protocol_violation("too many elements");
    }

    if (nA == 0 || nB == 0)
    {
        protocol_violation("invalid array");
    }
    for (int i = 0; i < nA; ++i)
    {
        if (A[i] < 0 || N <= A[i])
        {
            protocol_violation("invalid array");
        }
        if (present[A[i]])
        {
            protocol_violation("invalid array");
        }
        present[A[i]] = true;
    }
    for (int i = 0; i < nA; ++i)
    {
        present[A[i]] = false;
    }
    for (int i = 0; i < nB; ++i)
    {
        if (B[i] < 0 || N <= B[i])
        {
            protocol_violation("invalid array");
        }
        if (present[B[i]])
        {
            protocol_violation("invalid array");
        }
        present[B[i]] = true;
    }
    for (int i = 0; i < nB; ++i)
    {
        present[B[i]] = false;
    }

    for (int i = 0; i < nA; ++i)
    {
        for (int j = 0; j < nB; ++j)
        {
            if (A[i] == B[j])
            {
                protocol_violation("non-disjoint arrays");
            }
        }
    }

    for (int i = 0; i < nA; ++i)
    {
        for (int j = 0; j < nB; ++j)
        {
            if (U[std::max(A[i], B[j])][std::min(A[i], B[j])] == 1)
            {
                return true;
            }
        }
    }

    return false;
}

int main()
{
    assert(1 == scanf("%d", &C));
    int maximumCalls = 0;
    for (int c = 0; c < C; ++c)
    {
        call_counter = 0;
        assert(2 == scanf("%d %d", &N, &D));

        present.assign(N, false);
        U.resize(N);
        for (int i = 1; i < N; ++i)
        {
            U[i].resize(i);
            for (int j = 0; j < i; ++j)
            {
                assert(1 == scanf("%d", &U[i][j]));
            }
        }

        for (int i = 2; i < N; ++i)
        {
            for (int j = 1; j < i; ++j)
            {
                for (int k = 0; k < j; ++k)
                {
                    if (U[i][j] + U[i][k] + U[j][k] < D)
                    {
                        printf("Insufficient Density\n");
                        exit(0);
                    }
                }
            }
        }

        std::vector<int> t = longest_trip(N, D);
        int l = t.size();
        printf("%d\n", l);
        for (int i = 0; i < l; ++i)
        {
            printf(i == 0 ? "%d" : " %d", t[i]);
        }
        printf("\n");
        printf("%d\n", call_counter);

        maximumCalls = std::max(maximumCalls, call_counter);
        call_counter = 0;
    }
    printf("%d\n", maximumCalls);

    return 0;
}
#endif

Compilation message (stderr)

longesttrip.cpp: In function 'void makePath(std::vector<int>&, std::vector<int>&)':
longesttrip.cpp:185:13: warning: label 'out' defined but not used [-Wunused-label]
  185 |             out:
      |             ^~~

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