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Submission #1094660

# Submission time Handle Problem Language Result Execution time Memory
1094660 2024-09-30T08:56:51 Z not_amir Event Hopping (BOI22_events) C++14
25 / 100
 1500 ms 21244 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)
            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], {mp[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) {
            if(start[jump[y]] > start[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
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 152 ms 13872 KB Output is correct
3 Correct 153 ms 13904 KB Output is correct
4 Correct 142 ms 13864 KB Output is correct
5 Correct 155 ms 14416 KB Output is correct
6 Correct 158 ms 14928 KB Output is correct
7 Correct 154 ms 15184 KB Output is correct
8 Correct 152 ms 21076 KB Output is correct
9 Correct 146 ms 21060 KB Output is correct
10 Execution timed out 1550 ms 12536 KB Time limit exceeded
11 Halted 0 ms 0 KB -

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 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 Correct 1 ms 348 KB Output is correct
7 Correct 1 ms 604 KB Output is correct
8 Correct 1 ms 604 KB Output is correct
9 Correct 1 ms 348 KB Output is correct

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 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 Correct 1 ms 348 KB Output is correct
7 Correct 1 ms 604 KB Output is correct
8 Correct 1 ms 604 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 1 ms 348 KB Output is correct
14 Correct 1 ms 348 KB Output is correct
15 Correct 1 ms 348 KB Output is correct
16 Correct 1 ms 604 KB Output is correct
17 Correct 1 ms 604 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 25 ms 2508 KB Output is correct
20 Correct 28 ms 2416 KB Output is correct
21 Correct 365 ms 2640 KB Output is correct
22 Correct 18 ms 2652 KB Output is correct
23 Incorrect 21 ms 2908 KB Output isn't correct
24 Halted 0 ms 0 KB -

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 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 Correct 1 ms 348 KB Output is correct
7 Correct 1 ms 604 KB Output is correct
8 Correct 1 ms 604 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 1 ms 344 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 1 ms 352 KB Output is correct
14 Correct 1 ms 352 KB Output is correct
15 Correct 1 ms 348 KB Output is correct
16 Correct 1 ms 604 KB Output is correct
17 Correct 1 ms 604 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 108 ms 12208 KB Output is correct
20 Correct 141 ms 11348 KB Output is correct
21 Correct 116 ms 12112 KB Output is correct
22 Correct 129 ms 16040 KB Output is correct
23 Correct 128 ms 18812 KB Output is correct
24 Correct 167 ms 19024 KB Output is correct
25 Correct 18 ms 4696 KB Output is correct

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 142 ms 13904 KB Output is correct
2 Correct 151 ms 13860 KB Output is correct
3 Correct 153 ms 13908 KB Output is correct
4 Correct 159 ms 21244 KB Output is correct
5 Execution timed out 1535 ms 12508 KB Time limit exceeded
6 Halted 0 ms 0 KB -

Subtask #6
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 152 ms 13872 KB Output is correct
3 Correct 153 ms 13904 KB Output is correct
4 Correct 142 ms 13864 KB Output is correct
5 Correct 155 ms 14416 KB Output is correct
6 Correct 158 ms 14928 KB Output is correct
7 Correct 154 ms 15184 KB Output is correct
8 Correct 152 ms 21076 KB Output is correct
9 Correct 146 ms 21060 KB Output is correct
10 Execution timed out 1550 ms 12536 KB Time limit exceeded
11 Halted 0 ms 0 KB -