oj.uz

Submission #597027

# Submission time Handle Problem Language Result Execution time Memory
597027 2022-07-15T12:00:14 Z SlavicG Highway Tolls (IOI18_highway) C++17
100 / 100
 255 ms 19992 KB 
#include "highway.h"
#include "bits/stdc++.h"
using namespace std;
const int N = 4e5 + 10;
vector<pair<int, int>> adj[N];

long long start;
int query(int s, int m, vector<pair<int, int>> edges, vector<int> paiu) {
    if(edges.empty()) return s;
    int l = 0, r = (int)edges.size() - 1;
    vector<int> c(m, 0);
    for(auto x: paiu) c[x] = 1;
    reverse(edges.begin(), edges.end());
    int pos = -1;
    while(l <= r) {
        int mid = l + r >> 1;
        vector<int> rem = c;
        for(int j = 0; j <= mid; ++j) {
            c[edges[j].first] = 1;
        }
        if(ask(c) > start) {
            pos = mid, r = mid - 1;
        } else l = mid + 1;
        c = rem;
    }
    if(pos == -1) return s;
    return edges[pos].second;
}

void find_pair(int n, vector<int> u, vector<int> v, int a, int b) {
    int m = u.size();
    start = ask(vector<int>(m, 0));
    for(int i = 0; i < m; ++i) {
        adj[u[i]].push_back({i, v[i]});
        adj[v[i]].push_back({i, u[i]});
    }
    int l = 0, r = m - 1, p = -1;
    while(l <= r) {
        int mid = l + r >> 1;
        vector<int> qr(m, 0);
        for(int j = 0; j <= mid; ++j) qr[j] = 1;
        if(ask(qr) > start) {
            p = mid;
            r = mid - 1;
        } else l = mid + 1;
    }
    assert(p != -1);
    vector<vector<int>> dist(2, vector<int>(n, -1));
    vector<int> nodes = {u[p], v[p]};

    for(int j = 0; j < 2; ++j) {
        queue<int> q; q.push(nodes[j]);
        dist[j][nodes[j]] = 0;
        while(!q.empty()) {
            int u = q.front();
            q.pop();
            for(auto x: adj[u]) {
                int v = x.second;
                if(dist[j][v] == -1) {
                    dist[j][v] = dist[j][u] + 1;
                    q.push(v);
                }
            }
        }
    }
    vector<int> ans(2);
    for(int j = 0; j < 2; ++j) {
        vector<pair<int, int>> edges;
        queue<int> q; q.push(nodes[j]);
        vector<int> d(n, -1), paiu;
        d[nodes[j]] = 0;
        while(!q.empty()) {
            int u = q.front();
            q.pop();
            for(auto x: adj[u]) {
                int idx = x.first, v = x.second;
                if(dist[j][v] < dist[j ^ 1][v]) {
                    if(d[v] == -1) {
                        d[v] = d[u] + 1;
                        q.push(v);
                        edges.push_back({idx, v});
                    } else if(d[v] == d[u] + 1) {
                        paiu.push_back(idx);
                    }
                } else if(idx != p) {
                    paiu.push_back(idx);
                }
            }
        }
        ans[j] = query(nodes[j], m, edges, paiu);
    }
    //assert(ans[0] == 0 || ans[1] == 0);
    answer(ans[0], ans[1]);
}

Compilation message

highway.cpp: In function 'int query(int, int, std::vector<std::pair<int, int> >, std::vector<int>)':
highway.cpp:16:21: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   16 |         int mid = l + r >> 1;
      |                   ~~^~~
highway.cpp: In function 'void find_pair(int, std::vector<int>, std::vector<int>, int, int)':
highway.cpp:39:21: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   39 |         int mid = l + r >> 1;
      |                   ~~^~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 9680 KB Output is correct
2 Correct 5 ms 9696 KB Output is correct
3 Correct 5 ms 9672 KB Output is correct
4 Correct 5 ms 9680 KB Output is correct
5 Correct 5 ms 9692 KB Output is correct
6 Correct 5 ms 9680 KB Output is correct
7 Correct 5 ms 9680 KB Output is correct
8 Correct 5 ms 9656 KB Output is correct
9 Correct 5 ms 9604 KB Output is correct
10 Correct 5 ms 9680 KB Output is correct
11 Correct 5 ms 9680 KB Output is correct
12 Correct 5 ms 9680 KB Output is correct

Subtask #2
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 9716 KB Output is correct
2 Correct 18 ms 10612 KB Output is correct
3 Correct 163 ms 18008 KB Output is correct
4 Correct 126 ms 17976 KB Output is correct
5 Correct 117 ms 18008 KB Output is correct
6 Correct 113 ms 18064 KB Output is correct
7 Correct 151 ms 17980 KB Output is correct
8 Correct 166 ms 18016 KB Output is correct
9 Correct 150 ms 18008 KB Output is correct
10 Correct 119 ms 18036 KB Output is correct
11 Correct 129 ms 16860 KB Output is correct
12 Correct 127 ms 17140 KB Output is correct
13 Correct 124 ms 17412 KB Output is correct
14 Correct 129 ms 17404 KB Output is correct

Subtask #3
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 10524 KB Output is correct
2 Correct 24 ms 11380 KB Output is correct
3 Correct 34 ms 12144 KB Output is correct
4 Correct 136 ms 17256 KB Output is correct
5 Correct 135 ms 17184 KB Output is correct
6 Correct 109 ms 17164 KB Output is correct
7 Correct 103 ms 17380 KB Output is correct
8 Correct 106 ms 17028 KB Output is correct
9 Correct 103 ms 17080 KB Output is correct

Subtask #4
33.0 / 33.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 9680 KB Output is correct
2 Correct 21 ms 10448 KB Output is correct
3 Correct 107 ms 16188 KB Output is correct
4 Correct 152 ms 18004 KB Output is correct
5 Correct 178 ms 18012 KB Output is correct
6 Correct 113 ms 17996 KB Output is correct
7 Correct 127 ms 18012 KB Output is correct
8 Correct 156 ms 18000 KB Output is correct
9 Correct 154 ms 17916 KB Output is correct
10 Correct 165 ms 18088 KB Output is correct
11 Correct 127 ms 17428 KB Output is correct
12 Correct 136 ms 17244 KB Output is correct
13 Correct 189 ms 17164 KB Output is correct
14 Correct 128 ms 16952 KB Output is correct
15 Correct 119 ms 18064 KB Output is correct
16 Correct 109 ms 18004 KB Output is correct
17 Correct 170 ms 17328 KB Output is correct
18 Correct 146 ms 17496 KB Output is correct
19 Correct 172 ms 18016 KB Output is correct
20 Correct 128 ms 17352 KB Output is correct
21 Correct 105 ms 18200 KB Output is correct
22 Correct 103 ms 18180 KB Output is correct
23 Correct 141 ms 17704 KB Output is correct
24 Correct 122 ms 17660 KB Output is correct
25 Correct 158 ms 17468 KB Output is correct

Subtask #5
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 18 ms 10524 KB Output is correct
2 Correct 22 ms 10676 KB Output is correct
3 Correct 175 ms 18292 KB Output is correct
4 Correct 184 ms 18368 KB Output is correct
5 Correct 232 ms 19688 KB Output is correct
6 Correct 206 ms 19588 KB Output is correct
7 Correct 189 ms 19276 KB Output is correct
8 Correct 195 ms 19064 KB Output is correct
9 Correct 148 ms 17712 KB Output is correct
10 Correct 197 ms 18360 KB Output is correct
11 Correct 151 ms 18376 KB Output is correct
12 Correct 204 ms 18808 KB Output is correct
13 Correct 230 ms 18912 KB Output is correct
14 Correct 234 ms 19188 KB Output is correct
15 Correct 201 ms 19600 KB Output is correct
16 Correct 210 ms 17968 KB Output is correct
17 Correct 160 ms 18148 KB Output is correct
18 Correct 107 ms 18376 KB Output is correct
19 Correct 139 ms 18276 KB Output is correct
20 Correct 147 ms 18400 KB Output is correct
21 Correct 195 ms 19744 KB Output is correct

Subtask #6
31.0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 10568 KB Output is correct
2 Correct 20 ms 10704 KB Output is correct
3 Correct 158 ms 17772 KB Output is correct
4 Correct 143 ms 18140 KB Output is correct
5 Correct 177 ms 18444 KB Output is correct
6 Correct 174 ms 19160 KB Output is correct
7 Correct 185 ms 18432 KB Output is correct
8 Correct 138 ms 18460 KB Output is correct
9 Correct 159 ms 18080 KB Output is correct
10 Correct 229 ms 19296 KB Output is correct
11 Correct 215 ms 19268 KB Output is correct
12 Correct 207 ms 19064 KB Output is correct
13 Correct 187 ms 18660 KB Output is correct
14 Correct 153 ms 18152 KB Output is correct
15 Correct 189 ms 18672 KB Output is correct
16 Correct 181 ms 18076 KB Output is correct
17 Correct 143 ms 18672 KB Output is correct
18 Correct 173 ms 18332 KB Output is correct
19 Correct 179 ms 18856 KB Output is correct
20 Correct 168 ms 19300 KB Output is correct
21 Correct 213 ms 19260 KB Output is correct
22 Correct 201 ms 19268 KB Output is correct
23 Correct 255 ms 19308 KB Output is correct
24 Correct 179 ms 19152 KB Output is correct
25 Correct 234 ms 19476 KB Output is correct
26 Correct 190 ms 19472 KB Output is correct
27 Correct 101 ms 18292 KB Output is correct
28 Correct 152 ms 18312 KB Output is correct
29 Correct 114 ms 18520 KB Output is correct
30 Correct 145 ms 18412 KB Output is correct
31 Correct 110 ms 18284 KB Output is correct
32 Correct 108 ms 18196 KB Output is correct
33 Correct 133 ms 18472 KB Output is correct
34 Correct 105 ms 18284 KB Output is correct
35 Correct 134 ms 18268 KB Output is correct
36 Correct 145 ms 18164 KB Output is correct
37 Correct 107 ms 18548 KB Output is correct
38 Correct 150 ms 18432 KB Output is correct
39 Correct 228 ms 19992 KB Output is correct
40 Correct 170 ms 19780 KB Output is correct
41 Correct 157 ms 19948 KB Output is correct
42 Correct 230 ms 19508 KB Output is correct