oj.uz

Submission #587257

# Submission time Handle Problem Language Result Execution time Memory
587257 2022-07-01T14:29:17 Z Josia Highway Tolls (IOI18_highway) C++14
51 / 100
 245 ms 21660 KB 
#include <bits/stdc++.h>
#include "highway.h"

using namespace std;

#define int long long

vector<vector<int>> graph;
int normal;
map<pair<int, int>, int> edgeToIndex;

int bsEdges(int M) {
    int l=0; int r = M-1;

    while (l<r) {
        vector<signed> a(M, 0);
        int m = (l + r) / 2;
        for (int i=l; i<=m; i++) {
            a[i] = 1;
        }
        if (ask(a) != normal) {
            r = m;
        }
        else {
            l = m+1;
        }
    }

    return l;
}



vector<int> side;
vector<bool> visited;



void sideDFS(int v) {
    if (visited[v]) return;
    visited[v] = 1;

    side[v] = 1;

    for (int i: graph[v]) {
        sideDFS(i);
    }
}



vector<pair<int, int>> cand;

void findLevel(int v, int t, int l, int p) {
    if (visited[v]) return;
    visited[v] = 1;

    if (l == t) {
        cand.push_back({v, p});
    }

    for (int i: graph[v]) {
        findLevel(i, t, l+1, v);
    }
}



int BS2(vector<pair<int, int>> edges, int M) {
    int l = 0; int r = edges.size()-1;

    while (l<r) {
        vector<signed> a(M, 0);
        int m = (l + r) / 2;
        for (int i=l; i<=m; i++) {
            a[edgeToIndex[{min(edges[i].first, edges[i].second), max(edges[i].first, edges[i].second)}]] = 1;
        }
        if (ask(a) != normal) {
            r = m;
        }
        else {
            l = m+1;
        }
    }

    return edges[l].first;
}



void find_pair(signed N, std::vector<signed> U, std::vector<signed> V, signed A, signed B) {
    int M = U.size();
    assert(M == N-1);

    vector<signed> a(M, 0);
    normal = ask(a);

    vector<pair<int, int>> edges;
    graph.clear();
    graph.resize(N);

    edgeToIndex.clear();

    for (int i=0; i<M; i++) {
        edges.push_back({min(U[i], V[i]), max(U[i], V[i])});
        graph[U[i]].push_back(V[i]);
        graph[V[i]].push_back(U[i]);
        edgeToIndex[{min(U[i], V[i]), max(U[i], V[i])}] = i;
    }

    pair<int, int> edgeOnPath = edges[bsEdges(M)];


    side.assign(N, 0);
    visited.assign(N, 0);

    visited[edgeOnPath.second] = 1;
    sideDFS(edgeOnPath.first);

    pair<int, int> length;

    {
        vector<signed> askk(M, 0);
        for (int i=0; i<M; i++) {
            if (side[edges[i].first] && side[edges[i].second]) askk[i] = 1;
        }
        int tmp = ask(askk);


        length.first = ((tmp-normal)/(B-A));
        length.second = ((normal - (length.first * A)) / A) -1;
    }


    visited.assign(N, 0);
    cand.clear();

    visited[edgeOnPath.second] = 1;

    findLevel(edgeOnPath.first, length.first, 0, -1);


    int start = BS2(cand, M);



    visited.assign(N, 0);
    cand.clear();

    visited[edgeOnPath.first] = 1;

    findLevel(edgeOnPath.second, length.second, 0, -1);

    int end = BS2(cand, M);



    answer(min(start, end), max(start, end));
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 208 KB Output is correct
2 Correct 1 ms 208 KB Output is correct
3 Correct 1 ms 208 KB Output is correct
4 Correct 1 ms 208 KB Output is correct
5 Correct 1 ms 208 KB Output is correct
6 Correct 1 ms 208 KB Output is correct
7 Correct 0 ms 208 KB Output is correct
8 Correct 1 ms 208 KB Output is correct
9 Correct 0 ms 208 KB Output is correct
10 Correct 0 ms 208 KB Output is correct
11 Correct 1 ms 300 KB Output is correct
12 Correct 0 ms 208 KB Output is correct

Subtask #2
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 464 KB Output is correct
2 Correct 13 ms 1948 KB Output is correct
3 Correct 160 ms 16076 KB Output is correct
4 Correct 161 ms 16036 KB Output is correct
5 Correct 163 ms 16036 KB Output is correct
6 Correct 154 ms 15788 KB Output is correct
7 Correct 200 ms 16064 KB Output is correct
8 Correct 210 ms 15660 KB Output is correct
9 Correct 203 ms 15684 KB Output is correct
10 Correct 174 ms 16072 KB Output is correct
11 Correct 182 ms 16392 KB Output is correct
12 Correct 154 ms 17320 KB Output is correct
13 Correct 165 ms 16812 KB Output is correct
14 Correct 212 ms 16896 KB Output is correct

Subtask #3
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 2540 KB Output is correct
2 Correct 25 ms 4800 KB Output is correct
3 Correct 46 ms 7288 KB Output is correct
4 Correct 95 ms 19380 KB Output is correct
5 Correct 104 ms 19520 KB Output is correct
6 Correct 128 ms 20720 KB Output is correct
7 Correct 108 ms 21660 KB Output is correct
8 Correct 137 ms 20008 KB Output is correct
9 Correct 106 ms 20264 KB Output is correct

Subtask #4
33.0 / 33.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 464 KB Output is correct
2 Correct 17 ms 2032 KB Output is correct
3 Correct 110 ms 12212 KB Output is correct
4 Correct 209 ms 15916 KB Output is correct
5 Correct 231 ms 15584 KB Output is correct
6 Correct 188 ms 15564 KB Output is correct
7 Correct 184 ms 15588 KB Output is correct
8 Correct 223 ms 15572 KB Output is correct
9 Correct 180 ms 16040 KB Output is correct
10 Correct 203 ms 16076 KB Output is correct
11 Correct 212 ms 16432 KB Output is correct
12 Correct 162 ms 17324 KB Output is correct
13 Correct 173 ms 17060 KB Output is correct
14 Correct 227 ms 16928 KB Output is correct
15 Correct 206 ms 15640 KB Output is correct
16 Correct 168 ms 15576 KB Output is correct
17 Correct 166 ms 16676 KB Output is correct
18 Correct 208 ms 17028 KB Output is correct
19 Correct 226 ms 15688 KB Output is correct
20 Correct 158 ms 17708 KB Output is correct
21 Correct 236 ms 18608 KB Output is correct
22 Correct 234 ms 18688 KB Output is correct
23 Correct 212 ms 17556 KB Output is correct
24 Correct 245 ms 17548 KB Output is correct
25 Correct 192 ms 21444 KB Output is correct

Subtask #5
0 / 18.0

# Verdict Execution time Memory Grader output
1 Runtime error 8 ms 720 KB Execution killed with signal 6
2 Halted 0 ms 0 KB -

Subtask #6
0 / 31.0

# Verdict Execution time Memory Grader output
1 Runtime error 9 ms 756 KB Execution killed with signal 6
2 Halted 0 ms 0 KB -