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Submission #864521

# Submission time Handle Problem Language Result Execution time Memory
864521 2023-10-23T07:12:20 Z thinknoexit Highway Tolls (IOI18_highway) C++17
51 / 100
 97 ms 14580 KB 
#include <bits/stdc++.h>
#include "highway.h"
using namespace std;
using ll = long long;
const int N = 90090;
vector<pair<int, int>> adj[N], e;
int n;
int p[N], sz[N];
int fr(int i) {
    return (p[i] == i) ? i : p[i] = fr(p[i]);
}
void dfs(int v, int p = -1) {
    for (auto& x : adj[v]) {
        if (x.first == p) continue;
        e.push_back({ x.second, x.first });
        dfs(x.first, v);
    }
}
void find_pair(int NN, vector<int> U, vector<int> V, int A, int B) {
    n = NN;
    int m = U.size();
    for (int i = 0;i < n;i++) p[i] = i;
    for (int i = 0;i < m;i++) {
        int u = U[i], v = V[i];
        int pu = fr(u), pv = fr(v);
        if (pu != pv) {
            adj[u].push_back({ v,i });
            adj[v].push_back({ u,i });
            p[pu] = pv;
        }
    }
    vector<int> QQ(m, 0);
    ll mnp = ask(QQ);
    dfs(0);
    int l = 1, r = n - 1;
    while (l < r) {
        int mid = (l + r) / 2;
        vector<int> q(m, 1);
        for (int i = 0;i < mid;i++) {
            q[e[i].first] = 0;
        }
        if (ask(q) == mnp) r = mid;
        else l = mid + 1;
    }
    int city2 = e[l - 1].second;
    e.clear();
    dfs(city2);
    l = 1, r = n - 1;
    while (l < r) {
        int mid = (l + r) / 2;
        vector<int> q(m, 1);
        for (int i = 0;i < mid;i++) {
            q[e[i].first] = 0;
        }
        if (ask(q) == mnp) r = mid;
        else l = mid + 1;
    }
    int city1 = e[l - 1].second;
    answer(city1, city2);
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 3088 KB Output is correct
2 Correct 1 ms 3084 KB Output is correct
3 Correct 1 ms 3088 KB Output is correct
4 Correct 1 ms 3092 KB Output is correct
5 Correct 1 ms 3092 KB Output is correct
6 Correct 1 ms 3092 KB Output is correct
7 Correct 1 ms 3096 KB Output is correct
8 Correct 1 ms 3096 KB Output is correct
9 Correct 1 ms 3344 KB Output is correct
10 Correct 1 ms 3084 KB Output is correct
11 Correct 1 ms 3088 KB Output is correct
12 Correct 1 ms 3088 KB Output is correct

Subtask #2
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 3148 KB Output is correct
2 Correct 9 ms 3788 KB Output is correct
3 Correct 82 ms 9512 KB Output is correct
4 Correct 92 ms 9504 KB Output is correct
5 Correct 82 ms 9512 KB Output is correct
6 Correct 91 ms 9744 KB Output is correct
7 Correct 91 ms 9372 KB Output is correct
8 Correct 78 ms 9512 KB Output is correct
9 Correct 85 ms 9736 KB Output is correct
10 Correct 80 ms 9352 KB Output is correct
11 Correct 92 ms 10316 KB Output is correct
12 Correct 88 ms 11108 KB Output is correct
13 Correct 90 ms 10688 KB Output is correct
14 Correct 90 ms 10316 KB Output is correct

Subtask #3
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 4428 KB Output is correct
2 Correct 16 ms 6008 KB Output is correct
3 Correct 23 ms 6864 KB Output is correct
4 Correct 70 ms 14576 KB Output is correct
5 Correct 65 ms 14580 KB Output is correct
6 Correct 72 ms 14364 KB Output is correct
7 Correct 61 ms 14580 KB Output is correct
8 Correct 67 ms 14376 KB Output is correct
9 Correct 56 ms 14352 KB Output is correct

Subtask #4
33.0 / 33.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 3144 KB Output is correct
2 Correct 9 ms 3656 KB Output is correct
3 Correct 65 ms 8236 KB Output is correct
4 Correct 81 ms 9480 KB Output is correct
5 Correct 85 ms 9508 KB Output is correct
6 Correct 84 ms 9564 KB Output is correct
7 Correct 93 ms 9744 KB Output is correct
8 Correct 79 ms 9516 KB Output is correct
9 Correct 87 ms 9736 KB Output is correct
10 Correct 86 ms 9360 KB Output is correct
11 Correct 86 ms 10028 KB Output is correct
12 Correct 94 ms 11060 KB Output is correct
13 Correct 96 ms 10828 KB Output is correct
14 Correct 97 ms 10712 KB Output is correct
15 Correct 71 ms 9372 KB Output is correct
16 Correct 71 ms 9356 KB Output is correct
17 Correct 92 ms 10644 KB Output is correct
18 Correct 84 ms 10540 KB Output is correct
19 Correct 77 ms 9364 KB Output is correct
20 Correct 92 ms 11424 KB Output is correct
21 Correct 70 ms 10300 KB Output is correct
22 Correct 57 ms 9900 KB Output is correct
23 Correct 70 ms 9620 KB Output is correct
24 Correct 77 ms 10220 KB Output is correct
25 Correct 86 ms 14044 KB Output is correct

Subtask #5
0 / 18.0

# Verdict Execution time Memory Grader output
1 Incorrect 11 ms 3672 KB Output is incorrect: {s, t} is wrong.
2 Halted 0 ms 0 KB -

Subtask #6
0 / 31.0

# Verdict Execution time Memory Grader output
1 Incorrect 11 ms 3924 KB Output is incorrect: {s, t} is wrong.
2 Halted 0 ms 0 KB -