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Submission #895498

# Submission time Handle Problem Language Result Execution time Memory
895498 2023-12-30T05:50:43 Z 1bin Event Hopping (BOI22_events) C++14
100 / 100
 99 ms 20132 KB 
#include <bits/stdc++.h>

using namespace std;

#define all(v) v.begin(), v.end()
typedef long long ll;
const int b = 1 << 18;
int n, q, p[b][18], s[b], e[b], l, r;
pair<int, int> seg[b * 2];
vector<int> tmp;

void upd(int ix, pair<int, int> v){
    ix += b;
    while(ix){
        seg[ix] = min(seg[ix], v);
        ix /= 2;
    }
    return;
}

int qry(int l, int r){
    l += b; r += b;
    pair<int, int> ret = {2e9, -1};
    while(l <= r){
        if(l & 1) ret = min(ret, seg[l++]);
        if(!(r & 1)) ret = min(ret, seg[r--]);
        l /= 2; r /= 2;
    }
    return ret.second;
}

int main(void){
    ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);

    cin >> n >> q;
    for(int i = 1; i <= n; i++){
        cin >> s[i] >> e[i];
        tmp.emplace_back(s[i]);
        tmp.emplace_back(e[i]);
    }    
    sort(all(tmp));
    tmp.erase(unique(all(tmp)), tmp.end());

    memset(seg, 0x3f, sizeof(seg));
    for(int i = 1; i <= n; i++) {
        s[i] = lower_bound(all(tmp), s[i]) - tmp.begin();
        e[i] = lower_bound(all(tmp), e[i]) - tmp.begin(); 
        upd(e[i], {s[i], i});
    }
    for(int i = 1; i <= n; i++) p[i][0] = qry(s[i], e[i]);
    for(int j = 1; j < 17; j++)
        for(int i = 1; i <= n; i++) p[i][j] = p[p[i][j - 1]][j - 1];
    
    while(q--){
        cin >> l >> r;
        if(l == r) cout << "0\n";
        else if(e[r] < e[l]) cout << "impossible\n";
        else if(e[l] >= s[r]) cout << "1\n";
        else{
            int ans = 0;
            for(int i = 16; i >= 0; i--)
                if(e[l] < s[p[r][i]]) r = p[r][i], ans += 1 << i;
            if(s[p[r][0]] <= e[l]) cout << ans + 2 << '\n';
            else cout << "impossible\n";
        }
    }
    return 0;
}

Compilation message

events.cpp: In function 'int main()':
events.cpp:44:34: warning: 'void* memset(void*, int, size_t)' writing to an object of type 'struct std::pair<int, int>' with no trivial copy-assignment [-Wclass-memaccess]
   44 |     memset(seg, 0x3f, sizeof(seg));
      |                                  ^
In file included from /usr/include/c++/10/bits/stl_algobase.h:64,
                 from /usr/include/c++/10/bits/char_traits.h:39,
                 from /usr/include/c++/10/ios:40,
                 from /usr/include/c++/10/istream:38,
                 from /usr/include/c++/10/sstream:38,
                 from /usr/include/c++/10/complex:45,
                 from /usr/include/c++/10/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:54,
                 from events.cpp:1:
/usr/include/c++/10/bits/stl_pair.h:211:12: note: 'struct std::pair<int, int>' declared here
  211 |     struct pair
      |            ^~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6748 KB Output is correct
2 Correct 77 ms 19408 KB Output is correct
3 Correct 83 ms 19604 KB Output is correct
4 Correct 88 ms 19548 KB Output is correct
5 Correct 84 ms 19596 KB Output is correct
6 Correct 91 ms 19844 KB Output is correct
7 Correct 84 ms 19664 KB Output is correct
8 Correct 77 ms 19948 KB Output is correct
9 Correct 79 ms 19940 KB Output is correct
10 Correct 87 ms 20132 KB Output is correct
11 Correct 81 ms 19916 KB Output is correct
12 Correct 51 ms 19348 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6748 KB Output is correct
2 Correct 2 ms 6748 KB Output is correct
3 Correct 2 ms 6748 KB Output is correct
4 Correct 1 ms 6748 KB Output is correct
5 Correct 2 ms 6748 KB Output is correct
6 Correct 1 ms 6748 KB Output is correct
7 Correct 2 ms 6748 KB Output is correct
8 Correct 2 ms 6748 KB Output is correct
9 Correct 1 ms 6748 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6748 KB Output is correct
2 Correct 2 ms 6748 KB Output is correct
3 Correct 2 ms 6748 KB Output is correct
4 Correct 1 ms 6748 KB Output is correct
5 Correct 2 ms 6748 KB Output is correct
6 Correct 1 ms 6748 KB Output is correct
7 Correct 2 ms 6748 KB Output is correct
8 Correct 2 ms 6748 KB Output is correct
9 Correct 1 ms 6748 KB Output is correct
10 Correct 1 ms 6944 KB Output is correct
11 Correct 1 ms 6748 KB Output is correct
12 Correct 1 ms 6748 KB Output is correct
13 Correct 2 ms 6748 KB Output is correct
14 Correct 1 ms 6748 KB Output is correct
15 Correct 1 ms 6748 KB Output is correct
16 Correct 2 ms 6748 KB Output is correct
17 Correct 2 ms 6748 KB Output is correct
18 Correct 1 ms 6748 KB Output is correct
19 Correct 26 ms 10196 KB Output is correct
20 Correct 23 ms 10332 KB Output is correct
21 Correct 32 ms 10672 KB Output is correct
22 Correct 20 ms 10576 KB Output is correct
23 Correct 24 ms 10588 KB Output is correct
24 Correct 17 ms 10576 KB Output is correct
25 Correct 22 ms 10108 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6748 KB Output is correct
2 Correct 2 ms 6748 KB Output is correct
3 Correct 2 ms 6748 KB Output is correct
4 Correct 1 ms 6748 KB Output is correct
5 Correct 2 ms 6748 KB Output is correct
6 Correct 1 ms 6748 KB Output is correct
7 Correct 2 ms 6748 KB Output is correct
8 Correct 2 ms 6748 KB Output is correct
9 Correct 1 ms 6748 KB Output is correct
10 Correct 1 ms 6748 KB Output is correct
11 Correct 1 ms 6748 KB Output is correct
12 Correct 2 ms 6624 KB Output is correct
13 Correct 2 ms 6748 KB Output is correct
14 Correct 1 ms 6748 KB Output is correct
15 Correct 2 ms 6748 KB Output is correct
16 Correct 2 ms 6748 KB Output is correct
17 Correct 1 ms 6748 KB Output is correct
18 Correct 1 ms 6748 KB Output is correct
19 Correct 60 ms 17632 KB Output is correct
20 Correct 55 ms 17052 KB Output is correct
21 Correct 64 ms 17612 KB Output is correct
22 Correct 61 ms 18180 KB Output is correct
23 Correct 72 ms 17612 KB Output is correct
24 Correct 67 ms 17616 KB Output is correct
25 Correct 23 ms 17100 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 77 ms 19588 KB Output is correct
2 Correct 81 ms 19584 KB Output is correct
3 Correct 87 ms 19592 KB Output is correct
4 Correct 78 ms 19988 KB Output is correct
5 Correct 82 ms 19916 KB Output is correct
6 Correct 89 ms 19672 KB Output is correct
7 Correct 90 ms 19592 KB Output is correct
8 Correct 90 ms 19656 KB Output is correct
9 Correct 72 ms 17684 KB Output is correct
10 Correct 89 ms 19336 KB Output is correct
11 Correct 93 ms 19076 KB Output is correct
12 Correct 88 ms 19340 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6748 KB Output is correct
2 Correct 77 ms 19408 KB Output is correct
3 Correct 83 ms 19604 KB Output is correct
4 Correct 88 ms 19548 KB Output is correct
5 Correct 84 ms 19596 KB Output is correct
6 Correct 91 ms 19844 KB Output is correct
7 Correct 84 ms 19664 KB Output is correct
8 Correct 77 ms 19948 KB Output is correct
9 Correct 79 ms 19940 KB Output is correct
10 Correct 87 ms 20132 KB Output is correct
11 Correct 81 ms 19916 KB Output is correct
12 Correct 51 ms 19348 KB Output is correct
13 Correct 1 ms 6748 KB Output is correct
14 Correct 2 ms 6748 KB Output is correct
15 Correct 2 ms 6748 KB Output is correct
16 Correct 1 ms 6748 KB Output is correct
17 Correct 2 ms 6748 KB Output is correct
18 Correct 1 ms 6748 KB Output is correct
19 Correct 2 ms 6748 KB Output is correct
20 Correct 2 ms 6748 KB Output is correct
21 Correct 1 ms 6748 KB Output is correct
22 Correct 1 ms 6944 KB Output is correct
23 Correct 1 ms 6748 KB Output is correct
24 Correct 1 ms 6748 KB Output is correct
25 Correct 2 ms 6748 KB Output is correct
26 Correct 1 ms 6748 KB Output is correct
27 Correct 1 ms 6748 KB Output is correct
28 Correct 2 ms 6748 KB Output is correct
29 Correct 2 ms 6748 KB Output is correct
30 Correct 1 ms 6748 KB Output is correct
31 Correct 26 ms 10196 KB Output is correct
32 Correct 23 ms 10332 KB Output is correct
33 Correct 32 ms 10672 KB Output is correct
34 Correct 20 ms 10576 KB Output is correct
35 Correct 24 ms 10588 KB Output is correct
36 Correct 17 ms 10576 KB Output is correct
37 Correct 22 ms 10108 KB Output is correct
38 Correct 1 ms 6748 KB Output is correct
39 Correct 1 ms 6748 KB Output is correct
40 Correct 2 ms 6624 KB Output is correct
41 Correct 2 ms 6748 KB Output is correct
42 Correct 1 ms 6748 KB Output is correct
43 Correct 2 ms 6748 KB Output is correct
44 Correct 2 ms 6748 KB Output is correct
45 Correct 1 ms 6748 KB Output is correct
46 Correct 1 ms 6748 KB Output is correct
47 Correct 60 ms 17632 KB Output is correct
48 Correct 55 ms 17052 KB Output is correct
49 Correct 64 ms 17612 KB Output is correct
50 Correct 61 ms 18180 KB Output is correct
51 Correct 72 ms 17612 KB Output is correct
52 Correct 67 ms 17616 KB Output is correct
53 Correct 23 ms 17100 KB Output is correct
54 Correct 77 ms 19588 KB Output is correct
55 Correct 81 ms 19584 KB Output is correct
56 Correct 87 ms 19592 KB Output is correct
57 Correct 78 ms 19988 KB Output is correct
58 Correct 82 ms 19916 KB Output is correct
59 Correct 89 ms 19672 KB Output is correct
60 Correct 90 ms 19592 KB Output is correct
61 Correct 90 ms 19656 KB Output is correct
62 Correct 72 ms 17684 KB Output is correct
63 Correct 89 ms 19336 KB Output is correct
64 Correct 93 ms 19076 KB Output is correct
65 Correct 88 ms 19340 KB Output is correct
66 Correct 1 ms 6748 KB Output is correct
67 Correct 78 ms 19504 KB Output is correct
68 Correct 80 ms 19460 KB Output is correct
69 Correct 87 ms 19400 KB Output is correct
70 Correct 84 ms 19660 KB Output is correct
71 Correct 86 ms 19656 KB Output is correct
72 Correct 83 ms 19660 KB Output is correct
73 Correct 79 ms 19916 KB Output is correct
74 Correct 78 ms 20104 KB Output is correct
75 Correct 84 ms 19940 KB Output is correct
76 Correct 81 ms 19920 KB Output is correct
77 Correct 51 ms 19152 KB Output is correct
78 Correct 1 ms 6748 KB Output is correct
79 Correct 1 ms 6748 KB Output is correct
80 Correct 2 ms 6748 KB Output is correct
81 Correct 1 ms 6748 KB Output is correct
82 Correct 1 ms 6748 KB Output is correct
83 Correct 2 ms 6748 KB Output is correct
84 Correct 2 ms 6616 KB Output is correct
85 Correct 1 ms 6900 KB Output is correct
86 Correct 26 ms 10304 KB Output is correct
87 Correct 23 ms 10588 KB Output is correct
88 Correct 26 ms 10576 KB Output is correct
89 Correct 20 ms 10576 KB Output is correct
90 Correct 19 ms 10588 KB Output is correct
91 Correct 18 ms 10588 KB Output is correct
92 Correct 22 ms 10072 KB Output is correct
93 Correct 57 ms 17616 KB Output is correct
94 Correct 55 ms 17060 KB Output is correct
95 Correct 65 ms 17612 KB Output is correct
96 Correct 59 ms 17616 KB Output is correct
97 Correct 72 ms 17612 KB Output is correct
98 Correct 66 ms 17612 KB Output is correct
99 Correct 23 ms 17076 KB Output is correct
100 Correct 89 ms 19664 KB Output is correct
101 Correct 93 ms 19664 KB Output is correct
102 Correct 89 ms 19884 KB Output is correct
103 Correct 88 ms 19316 KB Output is correct
104 Correct 91 ms 19080 KB Output is correct
105 Correct 87 ms 19172 KB Output is correct
106 Correct 79 ms 18892 KB Output is correct
107 Correct 84 ms 18832 KB Output is correct
108 Correct 84 ms 19652 KB Output is correct
109 Correct 86 ms 19664 KB Output is correct
110 Correct 97 ms 19588 KB Output is correct
111 Correct 99 ms 19644 KB Output is correct