oj.uz

Submission #948001

# Submission time Handle Problem Language Result Execution time Memory
948001 2024-03-17T11:47:43 Z Nhoksocqt1 Longest Trip (IOI23_longesttrip) C++17
15 / 100
 17 ms 600 KB 
#ifndef Nhoksocqt1
    #include "longesttrip.h"
#endif // Nhoksocqt1
#include<bits/stdc++.h>
using namespace std;

#define inf 0x3f3f3f3f
#define sz(x) int((x).size())
#define fi first
#define se second
typedef long long ll;
typedef pair<int, int> ii;

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int Random(int l, int r) {
    return uniform_int_distribution<int>(l, r)(rng);
}

const int MAXN = 260;

#ifdef Nhoksocqt1

bitset<MAXN> adjp[MAXN], idA, idB, bsA, bsB;
struct Jury {
    int n, d;

    void init(int _n, int _d) {
        n = _n, d = _d;
        int u, v;
        bool check(0);
        while(cin >> u >> v) {
            adjp[u][v] = adjp[v][u] = 1;
            check = 1;
        }

        if(!check) {
            for (int i = 0; i < n; ++i) {
                for (int j = i + 1; j < n; ++j) {
                    for (int k = j + 1; k < n; ++k) {
                        int cnt = adjp[i][j] + adjp[i][k] + adjp[j][k];
                        if(cnt < d) {
                            vector<ii> p;
                            p.push_back(ii(i, j));
                            p.push_back(ii(i, k));
                            p.push_back(ii(j, k));

                            while(cnt < d) {
                                int r = Random(0, 2);
                                if(adjp[p[r].fi][p[r].se])
                                    continue;

                                ++cnt;
                                adjp[p[r].fi][p[r].se] = adjp[p[r].se][p[r].fi] = 1;
                                cout << p[r].fi << ' ' << p[r].se << '\n';
                            }
                        }
                    }
                }
            }
        }
    }

    bool are_connected(const vector<int> &A, const vector<int> &B) {
        bsA = bsB = idA = idB = 0;
        for (int it = 0; it < sz(A); ++it) {
            bsA |= adjp[A[it]];
            idA[A[it]] = 1;
        }

        for (int it = 0; it < sz(B); ++it) {
            bsB |= adjp[B[it]];
            idB[B[it]] = 1;
        }

        return ((bsA & idB).count() > 0 || (bsB & idA).count() > 0);
    }

} jury;

#endif // Nhoksocqt1

vector<int> A[MAXN];
int nxt[MAXN], numNode;
bool adj[MAXN][MAXN], dx[MAXN];

int cntAsk(0);
bool check_are_connected(vector<int> A, vector<int> B) {
    ++cntAsk;
    #ifdef Nhoksocqt1
        return jury.are_connected(A, B);
    #else
        return are_connected(A, B);
    #endif // Nhoksocqt1
}

void mergeLine(deque<int> &line1, deque<int> &line2, bool mergeBack1, bool mergeBack2) {
    if(mergeBack1 && mergeBack2) {
        while(sz(line2)) {
            line1.push_back(line2.back());
            line2.pop_back();
        }

        return;
    }

    if(!mergeBack1 && !mergeBack2) {
        while(sz(line2)) {
            line1.push_front(line2.front());
            line2.pop_front();
        }

        return;
    }

    if(!mergeBack1)
        swap(line1, line2);

    while(sz(line2)) {
        line1.push_back(line2.front());
        line2.pop_front();
    }
}

void mergeLine(deque<int> &line1, deque<int> &line2) {
    if(sz(line2) == 0)
        return;

    if(check_are_connected({line1.back()}, {line2.back()})) {
        mergeLine(line1, line2, 1, 1);
        return;
    }

    if(check_are_connected({line1.back()}, {line2.front()})) {
        mergeLine(line1, line2, 1, 0);
        return;
    }

    if(check_are_connected({line1.front()}, {line2.back()})) {
        mergeLine(line1, line2, 0, 1);
        return;
    }

    if(check_are_connected({line1.front()}, {line2.front()})) {
        mergeLine(line1, line2, 0, 0);
        return;
    }

    vector<int> l1, l2;
    while(sz(line1)) {
        l1.push_back(line1.front());
        line1.pop_front();
    }

    while(sz(line2)) {
        l2.push_back(line2.front());
        line2.pop_front();
    }

    if(!check_are_connected(l1, l2)) {
        for (int it = sz(l1) - 1; it >= 0; --it)
            line1.push_back(l1[it]);

        return;
    }

    int l(0), r(sz(l1) - 1), pos1(-1), pos2(-1);
    while(l <= r) {
        vector<int> p;
        int mid = (l + r) >> 1;
        for (int it = 0; it <= mid; ++it)
            p.push_back(l1[it]);

        if(check_are_connected(p, l2)) {
            pos1 = mid;
            r = mid - 1;
        } else {
            l = mid + 1;
        }
    }

    l = 0, r = sz(l2) - 1;
    while(l <= r) {
        vector<int> p;
        int mid = (l + r) >> 1;
        for (int it = 0; it <= mid; ++it)
            p.push_back(l2[it]);

        if(check_are_connected({l1[pos1]}, p)) {
            pos2 = mid;
            r = mid - 1;
        } else {
            l = mid + 1;
        }
    }

    vector<int> p;
    for (int i = pos1 - 1; i >= 0; --i)
        p.push_back(l1[i]);

    for (int i = sz(l1); i >= pos1; --i)
        p.push_back(l1[i]);

    for (int i = pos2; i >= 0; --i)
        p.push_back(l2[i]);

    for (int i = sz(l2) - 1; i > pos2; --i)
        p.push_back(l2[i]);

    while(sz(l1))
        l1.pop_back();

    for (int it = sz(p) - 1; it >= 0; --it)
        l1.push_back(p[it]);
}

vector<int> longest_trip(int N, int D) {
    numNode = N;
    if(D == 3) {
        vector<int> ans;
        for (int i = 0; i < numNode; ++i)
            ans.push_back(i);

        return ans;
    }

    vector<int> ans, id;
    for (int i = 0; i < numNode; ++i)
        id.push_back(i);

    shuffle(id.begin(), id.end(), rng);

    deque<int> line1, line2;
    line1.push_back(id[0]);
    line2.push_back(id[1]);

    bool needAsk(1);
    for (int i = 2; i < numNode; ++i) {
        if(check_are_connected({line1.back()}, {id[i]})) {
            line1.push_back(id[i]);
            needAsk = 1;
        } else
            if(!needAsk || check_are_connected({line2.back()}, {id[i]})) {
                line2.push_back(id[i]);
                needAsk = 0;
            } else {
                if(i + 2 < numNode) {
                    bool c1 = check_are_connected({id[i]}, {id[i + 1]});
                    bool c2 = check_are_connected({id[i]}, {id[i + 2]});

                    if(c1 && c2) {
                        mergeLine(line1, line2, 1, 1);
                        line2.push_back(id[i + 1]);
                        line2.push_back(id[i]);
                        line2.push_back(id[i + 2]);
                    } else
                        if(!c1 && !c2) {
                            line1.push_back(id[i + 1]);
                            line1.push_back(id[i + 2]);
                            mergeLine(line1, line2, 1, 1);
                            line2.push_back(id[i]);
                        } else {
                            if(!c1) {
                                line1.push_back(id[i + 1]);
                            } else {
                                line1.push_back(id[i + 2]);
                            }

                            mergeLine(line1, line2, 1, 1);
                            if(!c1) {
                                line2.push_back(id[i + 2]);
                            } else {
                                line2.push_back(id[i + 1]);
                            }

                            line2.push_back(id[i]);
                        }

                    i += 2;
                } else {
                    mergeLine(line1, line2, 1, 1);
                    line2.push_back(id[i]);
                }

                needAsk = 1;
            }
    }

    if(sz(line1) < sz(line2))
        swap(line1, line2);

    mergeLine(line1, line2);

    ans.clear();
    while(sz(line1)) {
        ans.push_back(line1.front());
        line1.pop_front();
    }

    for (int it = 0; it + 1 < sz(ans); ++it)
        assert(check_are_connected({ans[it]}, {ans[it + 1]}));

    return ans;
}

#ifdef Nhoksocqt1

int main(void) {
    ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);

    #define TASK "longesttrip"
    if(fopen(TASK".inp", "r")) {
        freopen(TASK".inp", "r", stdin);
        freopen(TASK".out", "w", stdout);
    }

    int n, d;
    cin >> n >> d;
    jury.init(n, d);

    vector<int> path = longest_trip(n, d);
    cout << "CNT ASK: " << cntAsk << '\n';
    cout << "ANSWER " << sz(path) << ": ";
    for (int it = 0; it < sz(path); ++it)
        cout << path[it] << ' '; cout << '\n';

    return 0;
}

#endif // Nhoksocqt1

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 2 ms 344 KB Output is correct
2 Correct 1 ms 344 KB Output is correct
3 Correct 0 ms 344 KB Output is correct
4 Correct 0 ms 344 KB Output is correct
5 Correct 0 ms 344 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 9 ms 344 KB Output is correct
3 Correct 9 ms 344 KB Output is correct
4 Correct 9 ms 344 KB Output is correct
5 Correct 9 ms 344 KB Output is correct
6 Correct 10 ms 344 KB Output is correct
7 Correct 11 ms 344 KB Output is correct
8 Correct 9 ms 344 KB Output is correct
9 Correct 10 ms 344 KB Output is correct
10 Correct 9 ms 344 KB Output is correct
11 Correct 8 ms 344 KB Output is correct
12 Correct 10 ms 344 KB Output is correct
13 Correct 11 ms 344 KB Output is correct

Subtask #3
0.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 424 KB Output is correct
2 Correct 9 ms 344 KB Output is correct
3 Correct 8 ms 344 KB Output is correct
4 Correct 11 ms 344 KB Output is correct
5 Correct 9 ms 344 KB Output is correct
6 Correct 11 ms 344 KB Output is correct
7 Correct 10 ms 344 KB Output is correct
8 Correct 9 ms 344 KB Output is correct
9 Correct 8 ms 344 KB Output is correct
10 Correct 9 ms 344 KB Output is correct
11 Correct 9 ms 344 KB Output is correct
12 Correct 10 ms 344 KB Output is correct
13 Correct 9 ms 344 KB Output is correct
14 Correct 15 ms 344 KB Output is correct
15 Correct 14 ms 344 KB Output is correct
16 Incorrect 1 ms 344 KB Incorrect
17 Halted 0 ms 0 KB -

Subtask #4
0.0 / 60.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 344 KB Output is correct
2 Correct 10 ms 344 KB Output is correct
3 Correct 9 ms 600 KB Output is correct
4 Correct 9 ms 344 KB Output is correct
5 Partially correct 9 ms 344 KB Output is partially correct
6 Correct 11 ms 344 KB Output is correct
7 Correct 9 ms 344 KB Output is correct
8 Correct 8 ms 344 KB Output is correct
9 Correct 9 ms 344 KB Output is correct
10 Partially correct 8 ms 344 KB Output is partially correct
11 Partially correct 10 ms 344 KB Output is partially correct
12 Partially correct 10 ms 344 KB Output is partially correct
13 Partially correct 12 ms 504 KB Output is partially correct
14 Correct 17 ms 344 KB Output is correct
15 Correct 11 ms 344 KB Output is correct
16 Incorrect 1 ms 344 KB Incorrect
17 Halted 0 ms 0 KB -