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Submission #653883

# Submission time Handle Problem Language Result Execution time Memory
653883 2022-10-28T17:32:20 Z couplefire Event Hopping (BOI22_events) C++17
100 / 100
 380 ms 36192 KB 
#include <bits/stdc++.h>
using namespace std;

const int N = 1<<17;
const int INF = 0x3f3f3f3f;

int n, q;
pair<int, int> segs[N];
map<int, int> mp;
vector<int> stuff;
vector<pair<int, int>> bruh[N<<1];
int tree[N<<2];
int to[N][20];

void upd(int pos, int val, int tl = 0, int tr = (N<<1)-1, int v = 1) {
    if (tr < pos || tl > pos) {
        return;
    }
    if (tl == tr) {
        tree[v] = min(tree[v], val);
        return;
    }
    int tm = (tl+tr)>>1;
    upd(pos, val, tl, tm, v<<1);
    upd(pos, val, tm+1, tr, v<<1|1);
    tree[v] = min(tree[v<<1], tree[v<<1|1]);
}

int query(int l, int r, int tl = 0, int tr = (N<<1)-1, int v = 1) {
    if (tr < l || tl > r) {
        return INF;
    }
    if (l <= tl && tr <= r) {
        return tree[v];
    }
    int tm = (tl+tr)>>1;
    return min(query(l, r, tl, tm, v<<1), query(l, r, tm+1, tr, v<<1|1));
}

int main() {
    // freopen("a.in", "r", stdin);
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    memset(tree, INF, sizeof tree);
    memset(to, -1, sizeof to);

    cin >> n >> q;
    for (int i = 0; i < n; ++i) {
        cin >> segs[i].first >> segs[i].second;
        stuff.push_back(segs[i].first);
        stuff.push_back(segs[i].second);
    }
    sort(stuff.begin(), stuff.end());
    stuff.erase(unique(stuff.begin(), stuff.end()), stuff.end());
    for (int i = 0; i < stuff.size(); ++i) {
        mp[stuff[i]] = i;
    }
    for (int i = 0; i < n; ++i) {
        segs[i].first = mp[segs[i].first];
        segs[i].second = mp[segs[i].second];
        upd(segs[i].second, segs[i].first);
        bruh[segs[i].first].push_back({segs[i].second, i});
    }
    for (int i = 0; i < (N<<1); ++i) {
        sort(bruh[i].begin(), bruh[i].end());
    }
    for (int i = 0; i < n; ++i) {
        int val = query(segs[i].first, segs[i].second);
        if (val < segs[i].first) {
            to[i][0] = (*lower_bound(bruh[val].begin(), bruh[val].end(), pair<int, int>{segs[i].first, -1})).second;
        }
    }
    for (int i = 1; i < 20; ++i) {
        for (int j = 0; j < n; ++j) {
            if (to[j][i-1] != -1) {
                to[j][i] = to[to[j][i-1]][i-1];
            }
        }
    }
    while (q--) {
        int s, e;
        cin >> s >> e;
        --s, --e;
        if (s == e) {
            cout << 0 << '\n';
            continue;
        }
        if (segs[s].second > segs[e].second) {
            cout << "impossible" << '\n';
            continue;
        }
        if (segs[s].second >= segs[e].first) {
            cout << 1 << '\n';
            continue;
        }
        int ans = 0, cur = e;
        for (int i = 19; i >= 0; --i) {
            if (to[cur][i] != -1 && segs[s].second < segs[to[cur][i]].first) {
                ans += (1<<i);
                cur = to[cur][i];
            }
        }
        if (to[cur][0] != -1) {
            cout << ans+2 << '\n';
        } else {
            cout << "impossible" << '\n';
        }
    }
}

Compilation message

events.cpp: In function 'int main()':
events.cpp:55:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   55 |     for (int i = 0; i < stuff.size(); ++i) {
      |                     ~~^~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 18772 KB Output is correct
2 Correct 204 ms 29416 KB Output is correct
3 Correct 236 ms 29216 KB Output is correct
4 Correct 284 ms 29296 KB Output is correct
5 Correct 286 ms 29904 KB Output is correct
6 Correct 230 ms 30200 KB Output is correct
7 Correct 274 ms 30364 KB Output is correct
8 Correct 249 ms 34428 KB Output is correct
9 Correct 289 ms 34444 KB Output is correct
10 Correct 294 ms 29676 KB Output is correct
11 Correct 271 ms 31552 KB Output is correct
12 Correct 131 ms 28172 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 18796 KB Output is correct
2 Correct 12 ms 18772 KB Output is correct
3 Correct 12 ms 18888 KB Output is correct
4 Correct 11 ms 18856 KB Output is correct
5 Correct 12 ms 18900 KB Output is correct
6 Correct 12 ms 18804 KB Output is correct
7 Correct 13 ms 18900 KB Output is correct
8 Correct 11 ms 18948 KB Output is correct
9 Correct 11 ms 18748 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 18796 KB Output is correct
2 Correct 12 ms 18772 KB Output is correct
3 Correct 12 ms 18888 KB Output is correct
4 Correct 11 ms 18856 KB Output is correct
5 Correct 12 ms 18900 KB Output is correct
6 Correct 12 ms 18804 KB Output is correct
7 Correct 13 ms 18900 KB Output is correct
8 Correct 11 ms 18948 KB Output is correct
9 Correct 11 ms 18748 KB Output is correct
10 Correct 11 ms 18800 KB Output is correct
11 Correct 10 ms 18772 KB Output is correct
12 Correct 10 ms 18900 KB Output is correct
13 Correct 13 ms 18852 KB Output is correct
14 Correct 11 ms 18892 KB Output is correct
15 Correct 11 ms 18772 KB Output is correct
16 Correct 11 ms 18864 KB Output is correct
17 Correct 13 ms 18880 KB Output is correct
18 Correct 10 ms 18772 KB Output is correct
19 Correct 47 ms 20684 KB Output is correct
20 Correct 50 ms 20744 KB Output is correct
21 Correct 48 ms 20976 KB Output is correct
22 Correct 42 ms 20968 KB Output is correct
23 Correct 39 ms 21196 KB Output is correct
24 Correct 37 ms 21104 KB Output is correct
25 Correct 45 ms 20812 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 18796 KB Output is correct
2 Correct 12 ms 18772 KB Output is correct
3 Correct 12 ms 18888 KB Output is correct
4 Correct 11 ms 18856 KB Output is correct
5 Correct 12 ms 18900 KB Output is correct
6 Correct 12 ms 18804 KB Output is correct
7 Correct 13 ms 18900 KB Output is correct
8 Correct 11 ms 18948 KB Output is correct
9 Correct 11 ms 18748 KB Output is correct
10 Correct 10 ms 18736 KB Output is correct
11 Correct 10 ms 18772 KB Output is correct
12 Correct 10 ms 18900 KB Output is correct
13 Correct 11 ms 18900 KB Output is correct
14 Correct 10 ms 18860 KB Output is correct
15 Correct 10 ms 18772 KB Output is correct
16 Correct 11 ms 18880 KB Output is correct
17 Correct 10 ms 18900 KB Output is correct
18 Correct 10 ms 18812 KB Output is correct
19 Correct 183 ms 30120 KB Output is correct
20 Correct 204 ms 29312 KB Output is correct
21 Correct 188 ms 28716 KB Output is correct
22 Correct 232 ms 31768 KB Output is correct
23 Correct 253 ms 34788 KB Output is correct
24 Correct 317 ms 34708 KB Output is correct
25 Correct 72 ms 23132 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 212 ms 29312 KB Output is correct
2 Correct 244 ms 29212 KB Output is correct
3 Correct 265 ms 29412 KB Output is correct
4 Correct 274 ms 34472 KB Output is correct
5 Correct 223 ms 29644 KB Output is correct
6 Correct 309 ms 34096 KB Output is correct
7 Correct 380 ms 34160 KB Output is correct
8 Correct 307 ms 34212 KB Output is correct
9 Correct 293 ms 33140 KB Output is correct
10 Correct 305 ms 33708 KB Output is correct
11 Correct 328 ms 33636 KB Output is correct
12 Correct 289 ms 33708 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 18772 KB Output is correct
2 Correct 204 ms 29416 KB Output is correct
3 Correct 236 ms 29216 KB Output is correct
4 Correct 284 ms 29296 KB Output is correct
5 Correct 286 ms 29904 KB Output is correct
6 Correct 230 ms 30200 KB Output is correct
7 Correct 274 ms 30364 KB Output is correct
8 Correct 249 ms 34428 KB Output is correct
9 Correct 289 ms 34444 KB Output is correct
10 Correct 294 ms 29676 KB Output is correct
11 Correct 271 ms 31552 KB Output is correct
12 Correct 131 ms 28172 KB Output is correct
13 Correct 10 ms 18796 KB Output is correct
14 Correct 12 ms 18772 KB Output is correct
15 Correct 12 ms 18888 KB Output is correct
16 Correct 11 ms 18856 KB Output is correct
17 Correct 12 ms 18900 KB Output is correct
18 Correct 12 ms 18804 KB Output is correct
19 Correct 13 ms 18900 KB Output is correct
20 Correct 11 ms 18948 KB Output is correct
21 Correct 11 ms 18748 KB Output is correct
22 Correct 11 ms 18800 KB Output is correct
23 Correct 10 ms 18772 KB Output is correct
24 Correct 10 ms 18900 KB Output is correct
25 Correct 13 ms 18852 KB Output is correct
26 Correct 11 ms 18892 KB Output is correct
27 Correct 11 ms 18772 KB Output is correct
28 Correct 11 ms 18864 KB Output is correct
29 Correct 13 ms 18880 KB Output is correct
30 Correct 10 ms 18772 KB Output is correct
31 Correct 47 ms 20684 KB Output is correct
32 Correct 50 ms 20744 KB Output is correct
33 Correct 48 ms 20976 KB Output is correct
34 Correct 42 ms 20968 KB Output is correct
35 Correct 39 ms 21196 KB Output is correct
36 Correct 37 ms 21104 KB Output is correct
37 Correct 45 ms 20812 KB Output is correct
38 Correct 10 ms 18736 KB Output is correct
39 Correct 10 ms 18772 KB Output is correct
40 Correct 10 ms 18900 KB Output is correct
41 Correct 11 ms 18900 KB Output is correct
42 Correct 10 ms 18860 KB Output is correct
43 Correct 10 ms 18772 KB Output is correct
44 Correct 11 ms 18880 KB Output is correct
45 Correct 10 ms 18900 KB Output is correct
46 Correct 10 ms 18812 KB Output is correct
47 Correct 183 ms 30120 KB Output is correct
48 Correct 204 ms 29312 KB Output is correct
49 Correct 188 ms 28716 KB Output is correct
50 Correct 232 ms 31768 KB Output is correct
51 Correct 253 ms 34788 KB Output is correct
52 Correct 317 ms 34708 KB Output is correct
53 Correct 72 ms 23132 KB Output is correct
54 Correct 212 ms 29312 KB Output is correct
55 Correct 244 ms 29212 KB Output is correct
56 Correct 265 ms 29412 KB Output is correct
57 Correct 274 ms 34472 KB Output is correct
58 Correct 223 ms 29644 KB Output is correct
59 Correct 309 ms 34096 KB Output is correct
60 Correct 380 ms 34160 KB Output is correct
61 Correct 307 ms 34212 KB Output is correct
62 Correct 293 ms 33140 KB Output is correct
63 Correct 305 ms 33708 KB Output is correct
64 Correct 328 ms 33636 KB Output is correct
65 Correct 289 ms 33708 KB Output is correct
66 Correct 11 ms 18772 KB Output is correct
67 Correct 224 ms 31116 KB Output is correct
68 Correct 216 ms 31072 KB Output is correct
69 Correct 260 ms 31016 KB Output is correct
70 Correct 233 ms 31588 KB Output is correct
71 Correct 239 ms 31968 KB Output is correct
72 Correct 284 ms 32132 KB Output is correct
73 Correct 244 ms 36168 KB Output is correct
74 Correct 227 ms 36192 KB Output is correct
75 Correct 268 ms 31376 KB Output is correct
76 Correct 267 ms 33372 KB Output is correct
77 Correct 122 ms 29996 KB Output is correct
78 Correct 10 ms 18772 KB Output is correct
79 Correct 13 ms 18848 KB Output is correct
80 Correct 14 ms 18812 KB Output is correct
81 Correct 10 ms 18900 KB Output is correct
82 Correct 10 ms 18900 KB Output is correct
83 Correct 10 ms 18964 KB Output is correct
84 Correct 10 ms 18900 KB Output is correct
85 Correct 10 ms 18768 KB Output is correct
86 Correct 55 ms 20692 KB Output is correct
87 Correct 45 ms 20760 KB Output is correct
88 Correct 48 ms 20992 KB Output is correct
89 Correct 38 ms 20944 KB Output is correct
90 Correct 42 ms 21172 KB Output is correct
91 Correct 41 ms 21092 KB Output is correct
92 Correct 47 ms 20724 KB Output is correct
93 Correct 188 ms 30076 KB Output is correct
94 Correct 240 ms 29216 KB Output is correct
95 Correct 210 ms 28772 KB Output is correct
96 Correct 202 ms 31776 KB Output is correct
97 Correct 262 ms 34732 KB Output is correct
98 Correct 271 ms 34748 KB Output is correct
99 Correct 66 ms 23128 KB Output is correct
100 Correct 366 ms 35844 KB Output is correct
101 Correct 322 ms 36016 KB Output is correct
102 Correct 300 ms 36052 KB Output is correct
103 Correct 317 ms 35584 KB Output is correct
104 Correct 324 ms 35356 KB Output is correct
105 Correct 310 ms 35656 KB Output is correct
106 Correct 209 ms 29248 KB Output is correct
107 Correct 297 ms 31304 KB Output is correct
108 Correct 225 ms 29940 KB Output is correct
109 Correct 250 ms 29948 KB Output is correct
110 Correct 319 ms 35720 KB Output is correct
111 Correct 325 ms 35784 KB Output is correct