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Submission #805140

# Submission time Handle Problem Language Result Execution time Memory
805140 2023-08-03T13:20:21 Z 1bin Highway Tolls (IOI18_highway) C++14
100 / 100
 159 ms 11296 KB 
#include <bits/stdc++.h>
#include "highway.h"

using namespace std;

#define all(v) v.begin(), v.end()
typedef long long ll;
const int NMAX = 1e5 + 5;
ll n, m, d[NMAX], cost;
vector<pair<int, int>> adj[NMAX];
vector<int> A[2];

/*
ll ask(vector<int> w){
    cout << "query : ";
    for(int i = 0; i < m; i++) cout << w[i] << ' ';
    cout << endl;
    ll x;
    cin >> x;
    return x;
}

void answer(int s, int t){
    cout << s << ' ' << t << '\n';
    return;
}
*/

void find_pair(int n_, vector<int> U, std::vector<int> V, int a, int b) {
    n = n_; m = U.size();
    for(int i = 0; i < m; i++){
        adj[U[i]].emplace_back(V[i], i);
        adj[V[i]].emplace_back(U[i], i);
    }
    cost = ask(vector<int>(m));
    int l = 0, r = m - 1, mid;
    while(l < r){
        mid = (l + r) / 2;
        vector<int> w(m);
        fill(w.begin(), w.begin() + mid + 1, 1);
        if(ask(w) > cost) r = mid;
        else l = mid + 1;
    }

    int u[2] = {U[l], V[l]};
    memset(d, 0x3f, sizeof(d));
    d[u[0]] = d[u[1]] = 1;
    queue<pair<int, int>> q;
    q.emplace(u[0], 0); q.emplace(u[1], 1);
    while(q.size()){
        auto[x, p] = q.front(); q.pop();
        A[p].emplace_back(x);
        for(auto&[nx, e] : adj[x])
            if(d[x] + 1 < d[nx]){
                d[nx] = d[x] + 1;
                q.emplace(nx, p);
            }
    }
    int v[2];
    for(int t = 0; t < 2; t++){
        int l = 0, r = A[t].size() - 1, mid;
        while(l < r){
            mid = (l + r) / 2;
            vector<int> w(m);
            for(int i = mid + 1; i <= r; i++)
                for(auto&[j, e] : adj[A[t][i]]) w[e] = 1;
            if(ask(w) > cost) l = mid + 1;
            else r = mid;
        }
        v[t] = A[t][l];
    }
    answer(v[0], v[1]);
    return;
}

/*
int main(void){
    ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);

    int n, m, a, b, s, t;
    cin >> n >> m >> a >> b >> s >> t;
    vector<int> U(m), V(m);
    for(int i = 0; i < m; i++) cin >> U[i] >> V[i];
    find_pair(n, U, V, a, b);
    return 0;
}
*/

Compilation message

highway.cpp: In function 'void find_pair(int, std::vector<int>, std::vector<int>, int, int)':
highway.cpp:51:13: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   51 |         auto[x, p] = q.front(); q.pop();
      |             ^
highway.cpp:53:18: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   53 |         for(auto&[nx, e] : adj[x])
      |                  ^
highway.cpp:66:26: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   66 |                 for(auto&[j, e] : adj[A[t][i]]) w[e] = 1;
      |                          ^

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 3408 KB Output is correct
2 Correct 2 ms 3408 KB Output is correct
3 Correct 2 ms 3432 KB Output is correct
4 Correct 2 ms 3408 KB Output is correct
5 Correct 2 ms 3408 KB Output is correct
6 Correct 2 ms 3408 KB Output is correct
7 Correct 2 ms 3432 KB Output is correct
8 Correct 3 ms 3584 KB Output is correct
9 Correct 2 ms 3408 KB Output is correct
10 Correct 2 ms 3432 KB Output is correct
11 Correct 2 ms 3408 KB Output is correct
12 Correct 2 ms 3408 KB Output is correct

Subtask #2
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 3408 KB Output is correct
2 Correct 11 ms 4060 KB Output is correct
3 Correct 107 ms 9084 KB Output is correct
4 Correct 84 ms 9100 KB Output is correct
5 Correct 72 ms 9112 KB Output is correct
6 Correct 75 ms 9108 KB Output is correct
7 Correct 101 ms 9108 KB Output is correct
8 Correct 115 ms 9096 KB Output is correct
9 Correct 78 ms 9088 KB Output is correct
10 Correct 105 ms 9064 KB Output is correct
11 Correct 90 ms 8664 KB Output is correct
12 Correct 100 ms 8556 KB Output is correct
13 Correct 73 ms 8540 KB Output is correct
14 Correct 81 ms 8532 KB Output is correct

Subtask #3
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 3944 KB Output is correct
2 Correct 16 ms 4560 KB Output is correct
3 Correct 22 ms 5228 KB Output is correct
4 Correct 55 ms 8716 KB Output is correct
5 Correct 124 ms 8644 KB Output is correct
6 Correct 62 ms 8640 KB Output is correct
7 Correct 71 ms 8532 KB Output is correct
8 Correct 73 ms 8608 KB Output is correct
9 Correct 84 ms 8524 KB Output is correct

Subtask #4
33.0 / 33.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 3480 KB Output is correct
2 Correct 12 ms 4112 KB Output is correct
3 Correct 70 ms 7904 KB Output is correct
4 Correct 96 ms 9092 KB Output is correct
5 Correct 95 ms 9064 KB Output is correct
6 Correct 115 ms 9072 KB Output is correct
7 Correct 102 ms 9088 KB Output is correct
8 Correct 109 ms 9080 KB Output is correct
9 Correct 80 ms 9140 KB Output is correct
10 Correct 99 ms 9108 KB Output is correct
11 Correct 92 ms 8532 KB Output is correct
12 Correct 95 ms 8564 KB Output is correct
13 Correct 106 ms 8640 KB Output is correct
14 Correct 74 ms 8604 KB Output is correct
15 Correct 93 ms 9180 KB Output is correct
16 Correct 105 ms 9100 KB Output is correct
17 Correct 99 ms 8536 KB Output is correct
18 Correct 75 ms 8540 KB Output is correct
19 Correct 71 ms 9096 KB Output is correct
20 Correct 64 ms 8500 KB Output is correct
21 Correct 105 ms 10000 KB Output is correct
22 Correct 73 ms 9988 KB Output is correct
23 Correct 67 ms 9684 KB Output is correct
24 Correct 75 ms 9604 KB Output is correct
25 Correct 81 ms 8688 KB Output is correct

Subtask #5
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 19 ms 4220 KB Output is correct
2 Correct 14 ms 4188 KB Output is correct
3 Correct 91 ms 9456 KB Output is correct
4 Correct 96 ms 9996 KB Output is correct
5 Correct 155 ms 11000 KB Output is correct
6 Correct 100 ms 11156 KB Output is correct
7 Correct 159 ms 11260 KB Output is correct
8 Correct 103 ms 11276 KB Output is correct
9 Correct 88 ms 9364 KB Output is correct
10 Correct 98 ms 9816 KB Output is correct
11 Correct 116 ms 10212 KB Output is correct
12 Correct 145 ms 10896 KB Output is correct
13 Correct 147 ms 11176 KB Output is correct
14 Correct 148 ms 11268 KB Output is correct
15 Correct 105 ms 10884 KB Output is correct
16 Correct 130 ms 10328 KB Output is correct
17 Correct 105 ms 10012 KB Output is correct
18 Correct 73 ms 10204 KB Output is correct
19 Correct 78 ms 10088 KB Output is correct
20 Correct 71 ms 10176 KB Output is correct
21 Correct 114 ms 10748 KB Output is correct

Subtask #6
31.0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 17 ms 4068 KB Output is correct
2 Correct 12 ms 4184 KB Output is correct
3 Correct 100 ms 9684 KB Output is correct
4 Correct 140 ms 9944 KB Output is correct
5 Correct 90 ms 10064 KB Output is correct
6 Correct 133 ms 11132 KB Output is correct
7 Correct 79 ms 9468 KB Output is correct
8 Correct 120 ms 9692 KB Output is correct
9 Correct 115 ms 10164 KB Output is correct
10 Correct 140 ms 11264 KB Output is correct
11 Correct 101 ms 11148 KB Output is correct
12 Correct 132 ms 11152 KB Output is correct
13 Correct 119 ms 10160 KB Output is correct
14 Correct 85 ms 9840 KB Output is correct
15 Correct 132 ms 10152 KB Output is correct
16 Correct 89 ms 9824 KB Output is correct
17 Correct 120 ms 10148 KB Output is correct
18 Correct 90 ms 9900 KB Output is correct
19 Correct 154 ms 10872 KB Output is correct
20 Correct 114 ms 10804 KB Output is correct
21 Correct 108 ms 11284 KB Output is correct
22 Correct 132 ms 11264 KB Output is correct
23 Correct 117 ms 11244 KB Output is correct
24 Correct 113 ms 11276 KB Output is correct
25 Correct 113 ms 11296 KB Output is correct
26 Correct 155 ms 11296 KB Output is correct
27 Correct 65 ms 10168 KB Output is correct
28 Correct 69 ms 10020 KB Output is correct
29 Correct 78 ms 10308 KB Output is correct
30 Correct 107 ms 10056 KB Output is correct
31 Correct 97 ms 10092 KB Output is correct
32 Correct 103 ms 10000 KB Output is correct
33 Correct 96 ms 10248 KB Output is correct
34 Correct 70 ms 10084 KB Output is correct
35 Correct 100 ms 10068 KB Output is correct
36 Correct 64 ms 9980 KB Output is correct
37 Correct 87 ms 10172 KB Output is correct
38 Correct 89 ms 10032 KB Output is correct
39 Correct 102 ms 10976 KB Output is correct
40 Correct 144 ms 10916 KB Output is correct
41 Correct 130 ms 10792 KB Output is correct
42 Correct 139 ms 11072 KB Output is correct