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Submission #250318

# Submission time Handle Problem Language Result Execution time Memory
250318 2020-07-17T11:45:38 Z Osama_Alkhodairy Highway Tolls (IOI18_highway) C++17
90 / 100
 384 ms 12612 KB 
#include <bits/stdc++.h>
#include "highway.h"
//~ #include "grader.cpp"
using namespace std;
#define ll long long

int n, m;
vector <pair <int, int> > es, g[90001];
ll light;
int dist;

int find(int root, int b){
    vector <bool> vis(n);
    queue <int> ready;
    vector <int> depth(n);
    ready.push(root);
    vector <int> nodes;
    vis[root] = 1;
    while(ready.size()){
        int node = ready.front();
        ready.pop();
        nodes.push_back(node);
        for(auto &i : g[node]){
            if(vis[i.first]) continue;
            vis[i.first] = 1;
            depth[i.first] = depth[node] + 1;
            ready.push(i.first);
        }
    }
    if(b){
        while(depth[nodes.back()] != dist){
            nodes.pop_back();
        }
    }
    reverse(nodes.begin(), nodes.end());
    if(b){
        while(depth[nodes.back()] != dist){
            nodes.pop_back();
        }
    }
    vis.assign(m, 0);
    vector <int> edges;
    for(auto &i : nodes){
        for(auto &j : g[i]){
            if(vis[j.second]) continue;
            vis[j.second] = 1;
            edges.push_back(j.second);
        }
    }
    int l = 0, r = (int)edges.size() - 1;
    while(max(depth[es[edges[r]].first], depth[es[edges[r]].second]) < dist / 2){
        r--;
    }
    while(l <= r){
        int mid = (l + r) / 2;
        vector <int> check(m);
        for(int i = 0 ; i <= mid ; i++){
            check[edges[i]] = 1;
        }
        if(ask(check) != light) r = mid - 1;
        else l = mid + 1;
    }
    auto edge = es[edges[l]];
    if(depth[edge.first] > depth[edge.second]) return edge.first;
    return edge.second;
}
void find_pair(int N, std::vector<int> u, std::vector<int> v, int a, int b) {
    n = N;
    m = u.size();
    for(int i = 0 ; i < m ; i++){
        g[u[i]].push_back(make_pair(v[i], i));
        g[v[i]].push_back(make_pair(u[i], i));
        es.push_back(make_pair(u[i], v[i]));
    }
    light = ask(vector <int>(m, 0));
    dist = light / a;
    int l = 0, r = m - 1;
    while(l <= r){
        int mid = (l + r) / 2;
        vector <int> check(m);
        for(int i = 0 ; i <= mid ; i++){
            check[i] = 1;
        }
        if(ask(check) != light) r = mid - 1;
        else l = mid + 1;
    }
    int root = es[l].first;
    int s = find(root, 0);
    int t = find(s, 1);
    answer(s, t);
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2432 KB Output is correct
2 Correct 3 ms 2432 KB Output is correct
3 Correct 2 ms 2432 KB Output is correct
4 Correct 2 ms 2432 KB Output is correct
5 Correct 2 ms 2432 KB Output is correct
6 Correct 2 ms 2432 KB Output is correct
7 Correct 2 ms 2432 KB Output is correct
8 Correct 2 ms 2432 KB Output is correct
9 Correct 2 ms 2432 KB Output is correct
10 Correct 2 ms 2432 KB Output is correct
11 Correct 2 ms 2432 KB Output is correct
12 Correct 2 ms 2432 KB Output is correct

Subtask #2
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 2560 KB Output is correct
2 Correct 14 ms 3200 KB Output is correct
3 Correct 149 ms 10016 KB Output is correct
4 Correct 176 ms 10032 KB Output is correct
5 Correct 148 ms 10012 KB Output is correct
6 Correct 257 ms 10024 KB Output is correct
7 Correct 138 ms 10012 KB Output is correct
8 Correct 150 ms 10072 KB Output is correct
9 Correct 214 ms 10024 KB Output is correct
10 Correct 254 ms 10096 KB Output is correct
11 Correct 157 ms 9728 KB Output is correct
12 Correct 151 ms 9796 KB Output is correct
13 Correct 265 ms 9716 KB Output is correct
14 Correct 250 ms 9712 KB Output is correct

Subtask #3
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 3200 KB Output is correct
2 Correct 46 ms 4084 KB Output is correct
3 Correct 34 ms 4796 KB Output is correct
4 Correct 158 ms 9728 KB Output is correct
5 Correct 109 ms 9728 KB Output is correct
6 Correct 218 ms 9720 KB Output is correct
7 Correct 108 ms 9732 KB Output is correct
8 Correct 100 ms 9720 KB Output is correct
9 Correct 107 ms 9912 KB Output is correct

Subtask #4
33.0 / 33.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 2560 KB Output is correct
2 Correct 18 ms 3200 KB Output is correct
3 Correct 221 ms 8660 KB Output is correct
4 Correct 145 ms 10084 KB Output is correct
5 Correct 254 ms 10012 KB Output is correct
6 Correct 145 ms 10004 KB Output is correct
7 Correct 137 ms 10012 KB Output is correct
8 Correct 138 ms 10016 KB Output is correct
9 Correct 223 ms 10016 KB Output is correct
10 Correct 263 ms 10020 KB Output is correct
11 Correct 150 ms 9828 KB Output is correct
12 Correct 146 ms 9724 KB Output is correct
13 Correct 135 ms 9716 KB Output is correct
14 Correct 272 ms 9728 KB Output is correct
15 Correct 140 ms 10100 KB Output is correct
16 Correct 256 ms 10024 KB Output is correct
17 Correct 146 ms 9724 KB Output is correct
18 Correct 152 ms 9932 KB Output is correct
19 Correct 143 ms 10028 KB Output is correct
20 Correct 138 ms 9728 KB Output is correct
21 Correct 122 ms 10112 KB Output is correct
22 Correct 123 ms 10200 KB Output is correct
23 Correct 235 ms 10300 KB Output is correct
24 Correct 244 ms 9820 KB Output is correct
25 Correct 212 ms 9572 KB Output is correct

Subtask #5
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 22 ms 3448 KB Output is correct
2 Correct 17 ms 3320 KB Output is correct
3 Correct 280 ms 10284 KB Output is correct
4 Correct 333 ms 10668 KB Output is correct
5 Correct 207 ms 12196 KB Output is correct
6 Correct 201 ms 12192 KB Output is correct
7 Correct 208 ms 12220 KB Output is correct
8 Correct 207 ms 12200 KB Output is correct
9 Correct 259 ms 10332 KB Output is correct
10 Correct 200 ms 11048 KB Output is correct
11 Correct 195 ms 11392 KB Output is correct
12 Correct 345 ms 11940 KB Output is correct
13 Correct 384 ms 12088 KB Output is correct
14 Correct 349 ms 12412 KB Output is correct
15 Correct 218 ms 12396 KB Output is correct
16 Correct 320 ms 11260 KB Output is correct
17 Correct 240 ms 10200 KB Output is correct
18 Correct 264 ms 10420 KB Output is correct
19 Correct 191 ms 10204 KB Output is correct
20 Correct 149 ms 10324 KB Output is correct
21 Correct 203 ms 12232 KB Output is correct

Subtask #6
21.0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 24 ms 3320 KB Output is correct
2 Correct 44 ms 3488 KB Output is correct
3 Correct 188 ms 10336 KB Output is correct
4 Correct 265 ms 10556 KB Output is correct
5 Correct 324 ms 11044 KB Output is correct
6 Correct 382 ms 12280 KB Output is correct
7 Correct 173 ms 10336 KB Output is correct
8 Correct 175 ms 10528 KB Output is correct
9 Correct 333 ms 10572 KB Output is correct
10 Partially correct 218 ms 12288 KB Output is partially correct
11 Correct 364 ms 12224 KB Output is correct
12 Partially correct 235 ms 12332 KB Output is partially correct
13 Partially correct 319 ms 11240 KB Output is partially correct
14 Partially correct 194 ms 11048 KB Output is partially correct
15 Partially correct 265 ms 11220 KB Output is partially correct
16 Partially correct 175 ms 11044 KB Output is partially correct
17 Partially correct 168 ms 11224 KB Output is partially correct
18 Partially correct 189 ms 10968 KB Output is partially correct
19 Partially correct 290 ms 11864 KB Output is partially correct
20 Correct 353 ms 12128 KB Output is correct
21 Partially correct 219 ms 12472 KB Output is partially correct
22 Correct 365 ms 12612 KB Output is correct
23 Correct 216 ms 12480 KB Output is correct
24 Correct 205 ms 12420 KB Output is correct
25 Partially correct 220 ms 12388 KB Output is partially correct
26 Partially correct 226 ms 12396 KB Output is partially correct
27 Partially correct 140 ms 10320 KB Output is partially correct
28 Partially correct 254 ms 10276 KB Output is partially correct
29 Partially correct 152 ms 10448 KB Output is partially correct
30 Partially correct 217 ms 10248 KB Output is partially correct
31 Correct 259 ms 10428 KB Output is correct
32 Correct 134 ms 10140 KB Output is correct
33 Partially correct 151 ms 10660 KB Output is partially correct
34 Partially correct 148 ms 10204 KB Output is partially correct
35 Correct 274 ms 10208 KB Output is correct
36 Partially correct 253 ms 10108 KB Output is partially correct
37 Partially correct 222 ms 10436 KB Output is partially correct
38 Partially correct 141 ms 10272 KB Output is partially correct
39 Correct 229 ms 12232 KB Output is correct
40 Correct 208 ms 12228 KB Output is correct
41 Correct 195 ms 12224 KB Output is correct
42 Correct 333 ms 12284 KB Output is correct