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Submission #1094681

# Submission time Handle Problem Language Result Execution time Memory
1094681 2024-09-30T09:30:37 Z not_amir Event Hopping (BOI22_events) C++14
30 / 100
 164 ms 21108 KB 
#include <bits/stdc++.h>
using namespace  std;

typedef pair<int, int> pii;
constexpr int INF = 1e9;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int n, q;
    cin >> n >> q;
    vector<pair<pii, int>> events(n);
    vector<int> start(n), end(n);
    map<int, int> mp;
    for(int i = 0; i < n; i++) {
        cin >> start[i] >> end[i];
        events[i].first = {end[i], start[i]};
        mp[start[i]] = mp[end[i]] = 1;
        events[i].second = i;
    }
    int t = 0;
    for(auto& [x, cmp] : mp)
        cmp = t++;
    sort(events.begin(), events.end());
    int N = 1 << 32 - __builtin_clz(t - 1);
    vector<pii> st(2 * N, {INF, -1});
    vector<int> parent(n), jump(n), depth(n);
    for(int i = 0; i < n; i++) {
        int e = events[i].first.first, s = events[i].first.second;
        pii ans = {INF, -1};
        for(int l = N + mp[s], r = 2 * N; l < r; l >>= 1, r >>= 1) {
            if(l & 1) ans = min(ans, st[l++]);
            if(r & 1) ans = min(ans, st[--r]);
        }
        int v = events[i].second;
        if(ans.second == -1 || ans.first >= s)
            jump[v] = parent[v] = v;
        else {
            int p = parent[v] = ans.second;
            depth[v] = depth[p] + 1;
            if(depth[p] - depth[jump[p]] == depth[jump[p]] - depth[jump[jump[p]]])
                jump[v] = jump[jump[p]];
            else
                jump[v] = p;
        }
        for(int j = N + mp[e]; j > 0; j >>= 1)
            st[j] = min(st[j], {s, v});
    }
    while(q--) {
        int x, y;
        cin >> x >> y;
        x--;
        y--;
        int d = depth[y];
        while(!(end[x] >= start[y] && end[x] <= end[y]) && x != y && parent[y] != y && end[y] >= end[x]) {
            if(end[jump[y]] > end[x])
                y = jump[y];
            else
                y = parent[y];
        }
        if(end[x] >= start[y] && end[x] <= end[y])
            cout << (x!=y) + d - depth[y] << '\n';
        else
            cout << "impossible\n";
    }
}

Compilation message

events.cpp: In function 'int main()':
events.cpp:22:15: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   22 |     for(auto& [x, cmp] : mp)
      |               ^
events.cpp:25:21: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
   25 |     int N = 1 << 32 - __builtin_clz(t - 1);
      |                  ~~~^~~~~~~~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 114 ms 13900 KB Output is correct
3 Correct 123 ms 13904 KB Output is correct
4 Correct 120 ms 13908 KB Output is correct
5 Correct 124 ms 14420 KB Output is correct
6 Correct 134 ms 15020 KB Output is correct
7 Correct 137 ms 15188 KB Output is correct
8 Correct 109 ms 21076 KB Output is correct
9 Correct 112 ms 21108 KB Output is correct
10 Correct 118 ms 14388 KB Output is correct
11 Correct 111 ms 18204 KB Output is correct
12 Correct 67 ms 13608 KB Output is correct

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 604 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Incorrect 1 ms 348 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 604 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Incorrect 1 ms 348 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #4
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 604 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Incorrect 1 ms 348 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 114 ms 13904 KB Output is correct
2 Correct 115 ms 13928 KB Output is correct
3 Correct 119 ms 13932 KB Output is correct
4 Correct 116 ms 21072 KB Output is correct
5 Correct 107 ms 14448 KB Output is correct
6 Correct 139 ms 20800 KB Output is correct
7 Correct 137 ms 20820 KB Output is correct
8 Correct 124 ms 20820 KB Output is correct
9 Correct 96 ms 19028 KB Output is correct
10 Correct 158 ms 20356 KB Output is correct
11 Correct 137 ms 20364 KB Output is correct
12 Correct 164 ms 20560 KB Output is correct

Subtask #6
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 114 ms 13900 KB Output is correct
3 Correct 123 ms 13904 KB Output is correct
4 Correct 120 ms 13908 KB Output is correct
5 Correct 124 ms 14420 KB Output is correct
6 Correct 134 ms 15020 KB Output is correct
7 Correct 137 ms 15188 KB Output is correct
8 Correct 109 ms 21076 KB Output is correct
9 Correct 112 ms 21108 KB Output is correct
10 Correct 118 ms 14388 KB Output is correct
11 Correct 111 ms 18204 KB Output is correct
12 Correct 67 ms 13608 KB Output is correct
13 Correct 0 ms 604 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 1 ms 348 KB Output is correct
16 Correct 1 ms 348 KB Output is correct
17 Correct 1 ms 348 KB Output is correct
18 Incorrect 1 ms 348 KB Output isn't correct
19 Halted 0 ms 0 KB -