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Submission #598101

# Submission time Handle Problem Language Result Execution time Memory
598101 2022-07-17T14:59:50 Z jhnah917 Event Hopping (BOI22_events) C++14
100 / 100
 198 ms 18888 KB 
#include <bits/stdc++.h>
using namespace std;
constexpr int SZ = 1 << 18, INF = 0x3f3f3f3f;

pair<int,int> T[SZ<<1];
pair<int,int> Query(int l, int r){
    l |= SZ; r |= SZ; pair<int,int> ret(INF,0);
    while(l <= r){
        if(l & 1) ret = min(ret, T[l++]);
        if(~r & 1) ret = min(ret, T[r--]);
        l >>= 1; r >>= 1;
    }
    return ret;
}

int N, K, Q, S[101010], E[101010], P[22][101010];
vector<int> C;
inline bool Check(int a, int b){ return S[b] <= E[a] && E[a] <= E[b]; }

int Solve(int a, int b){
    int ret = 0;
    if(a == b) return 0;
    for(int i=21; i>=0; i--) if(S[P[i][b]] > S[a]) b = P[i][b], ret |= 1 << i;
    if(ret + 1 == (1<<22)) return -1;
    if(E[a] > E[b]) return -1;
    if(Check(a, b)) return ret + 1;
    if(P[0][b] != 0 && Check(a, P[0][b])) return ret + 2;
    return -1;
}

int main(){
    ios_base::sync_with_stdio(false); cin.tie(nullptr);
    cin >> N >> Q; C.reserve(N+N);
    for(int i=1; i<=N; i++) cin >> S[i] >> E[i], C.push_back(S[i]), C.push_back(E[i]);
    sort(C.begin(), C.end()); C.erase(unique(C.begin(), C.end()), C.end()); K = C.size();
    for(int i=1; i<=N; i++){
        S[i] = lower_bound(C.begin(), C.end(), S[i]) - C.begin() + 1;
        E[i] = lower_bound(C.begin(), C.end(), E[i]) - C.begin() + 1;
    }

    fill(T, T+SZ*2, make_pair(INF,0));
    for(int i=1; i<=N; i++) T[E[i]|SZ] = min(T[E[i]|SZ], make_pair(S[i], i));
    for(int i=SZ-1; i; i--) T[i] = min(T[i<<1], T[i<<1|1]);
    for(int i=1; i<=N; i++) P[0][i] = Query(S[i], E[i]).second;
    for(int i=1; i<22; i++) for(int j=1; j<=N; j++) P[i][j] = P[i-1][P[i-1][j]];

    for(int q=1; q<=Q; q++){
        int a, b; cin >> a >> b;
        int res = Solve(a, b);
        if(res != -1) cout << res << "\n";
        else cout << "impossible\n";
    }
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4540 KB Output is correct
2 Correct 120 ms 18380 KB Output is correct
3 Correct 106 ms 18332 KB Output is correct
4 Correct 143 ms 18212 KB Output is correct
5 Correct 124 ms 18372 KB Output is correct
6 Correct 130 ms 18528 KB Output is correct
7 Correct 117 ms 18508 KB Output is correct
8 Correct 142 ms 18800 KB Output is correct
9 Correct 171 ms 18724 KB Output is correct
10 Correct 138 ms 18640 KB Output is correct
11 Correct 118 ms 18624 KB Output is correct
12 Correct 64 ms 18020 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4436 KB Output is correct
2 Correct 3 ms 4436 KB Output is correct
3 Correct 4 ms 4564 KB Output is correct
4 Correct 3 ms 4564 KB Output is correct
5 Correct 4 ms 4628 KB Output is correct
6 Correct 4 ms 4588 KB Output is correct
7 Correct 3 ms 4564 KB Output is correct
8 Correct 3 ms 4564 KB Output is correct
9 Correct 4 ms 4564 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4436 KB Output is correct
2 Correct 3 ms 4436 KB Output is correct
3 Correct 4 ms 4564 KB Output is correct
4 Correct 3 ms 4564 KB Output is correct
5 Correct 4 ms 4628 KB Output is correct
6 Correct 4 ms 4588 KB Output is correct
7 Correct 3 ms 4564 KB Output is correct
8 Correct 3 ms 4564 KB Output is correct
9 Correct 4 ms 4564 KB Output is correct
10 Correct 3 ms 4436 KB Output is correct
11 Correct 3 ms 4436 KB Output is correct
12 Correct 5 ms 4596 KB Output is correct
13 Correct 4 ms 4564 KB Output is correct
14 Correct 4 ms 4564 KB Output is correct
15 Correct 6 ms 4564 KB Output is correct
16 Correct 4 ms 4564 KB Output is correct
17 Correct 3 ms 4564 KB Output is correct
18 Correct 3 ms 4564 KB Output is correct
19 Correct 38 ms 6408 KB Output is correct
20 Correct 34 ms 6568 KB Output is correct
21 Correct 34 ms 6772 KB Output is correct
22 Correct 33 ms 6812 KB Output is correct
23 Correct 36 ms 6628 KB Output is correct
24 Correct 33 ms 6600 KB Output is correct
25 Correct 30 ms 6348 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4436 KB Output is correct
2 Correct 3 ms 4436 KB Output is correct
3 Correct 4 ms 4564 KB Output is correct
4 Correct 3 ms 4564 KB Output is correct
5 Correct 4 ms 4628 KB Output is correct
6 Correct 4 ms 4588 KB Output is correct
7 Correct 3 ms 4564 KB Output is correct
8 Correct 3 ms 4564 KB Output is correct
9 Correct 4 ms 4564 KB Output is correct
10 Correct 3 ms 4436 KB Output is correct
11 Correct 2 ms 4436 KB Output is correct
12 Correct 3 ms 4620 KB Output is correct
13 Correct 3 ms 4600 KB Output is correct
14 Correct 4 ms 4644 KB Output is correct
15 Correct 5 ms 4588 KB Output is correct
16 Correct 4 ms 4564 KB Output is correct
17 Correct 4 ms 4600 KB Output is correct
18 Correct 3 ms 4588 KB Output is correct
19 Correct 68 ms 16500 KB Output is correct
20 Correct 60 ms 15820 KB Output is correct
21 Correct 71 ms 16284 KB Output is correct
22 Correct 65 ms 16336 KB Output is correct
23 Correct 83 ms 16528 KB Output is correct
24 Correct 89 ms 16532 KB Output is correct
25 Correct 30 ms 15796 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 91 ms 18380 KB Output is correct
2 Correct 116 ms 18344 KB Output is correct
3 Correct 198 ms 18100 KB Output is correct
4 Correct 129 ms 18608 KB Output is correct
5 Correct 119 ms 18640 KB Output is correct
6 Correct 131 ms 18448 KB Output is correct
7 Correct 129 ms 18392 KB Output is correct
8 Correct 124 ms 18660 KB Output is correct
9 Correct 90 ms 16472 KB Output is correct
10 Correct 118 ms 18108 KB Output is correct
11 Correct 113 ms 17904 KB Output is correct
12 Correct 130 ms 18048 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4540 KB Output is correct
2 Correct 120 ms 18380 KB Output is correct
3 Correct 106 ms 18332 KB Output is correct
4 Correct 143 ms 18212 KB Output is correct
5 Correct 124 ms 18372 KB Output is correct
6 Correct 130 ms 18528 KB Output is correct
7 Correct 117 ms 18508 KB Output is correct
8 Correct 142 ms 18800 KB Output is correct
9 Correct 171 ms 18724 KB Output is correct
10 Correct 138 ms 18640 KB Output is correct
11 Correct 118 ms 18624 KB Output is correct
12 Correct 64 ms 18020 KB Output is correct
13 Correct 3 ms 4436 KB Output is correct
14 Correct 3 ms 4436 KB Output is correct
15 Correct 4 ms 4564 KB Output is correct
16 Correct 3 ms 4564 KB Output is correct
17 Correct 4 ms 4628 KB Output is correct
18 Correct 4 ms 4588 KB Output is correct
19 Correct 3 ms 4564 KB Output is correct
20 Correct 3 ms 4564 KB Output is correct
21 Correct 4 ms 4564 KB Output is correct
22 Correct 3 ms 4436 KB Output is correct
23 Correct 3 ms 4436 KB Output is correct
24 Correct 5 ms 4596 KB Output is correct
25 Correct 4 ms 4564 KB Output is correct
26 Correct 4 ms 4564 KB Output is correct
27 Correct 6 ms 4564 KB Output is correct
28 Correct 4 ms 4564 KB Output is correct
29 Correct 3 ms 4564 KB Output is correct
30 Correct 3 ms 4564 KB Output is correct
31 Correct 38 ms 6408 KB Output is correct
32 Correct 34 ms 6568 KB Output is correct
33 Correct 34 ms 6772 KB Output is correct
34 Correct 33 ms 6812 KB Output is correct
35 Correct 36 ms 6628 KB Output is correct
36 Correct 33 ms 6600 KB Output is correct
37 Correct 30 ms 6348 KB Output is correct
38 Correct 3 ms 4436 KB Output is correct
39 Correct 2 ms 4436 KB Output is correct
40 Correct 3 ms 4620 KB Output is correct
41 Correct 3 ms 4600 KB Output is correct
42 Correct 4 ms 4644 KB Output is correct
43 Correct 5 ms 4588 KB Output is correct
44 Correct 4 ms 4564 KB Output is correct
45 Correct 4 ms 4600 KB Output is correct
46 Correct 3 ms 4588 KB Output is correct
47 Correct 68 ms 16500 KB Output is correct
48 Correct 60 ms 15820 KB Output is correct
49 Correct 71 ms 16284 KB Output is correct
50 Correct 65 ms 16336 KB Output is correct
51 Correct 83 ms 16528 KB Output is correct
52 Correct 89 ms 16532 KB Output is correct
53 Correct 30 ms 15796 KB Output is correct
54 Correct 91 ms 18380 KB Output is correct
55 Correct 116 ms 18344 KB Output is correct
56 Correct 198 ms 18100 KB Output is correct
57 Correct 129 ms 18608 KB Output is correct
58 Correct 119 ms 18640 KB Output is correct
59 Correct 131 ms 18448 KB Output is correct
60 Correct 129 ms 18392 KB Output is correct
61 Correct 124 ms 18660 KB Output is correct
62 Correct 90 ms 16472 KB Output is correct
63 Correct 118 ms 18108 KB Output is correct
64 Correct 113 ms 17904 KB Output is correct
65 Correct 130 ms 18048 KB Output is correct
66 Correct 4 ms 4436 KB Output is correct
67 Correct 93 ms 18192 KB Output is correct
68 Correct 126 ms 18244 KB Output is correct
69 Correct 150 ms 18376 KB Output is correct
70 Correct 136 ms 18564 KB Output is correct
71 Correct 122 ms 18328 KB Output is correct
72 Correct 118 ms 18380 KB Output is correct
73 Correct 137 ms 18696 KB Output is correct
74 Correct 143 ms 18888 KB Output is correct
75 Correct 141 ms 18616 KB Output is correct
76 Correct 128 ms 18764 KB Output is correct
77 Correct 60 ms 18072 KB Output is correct
78 Correct 3 ms 4436 KB Output is correct
79 Correct 3 ms 4564 KB Output is correct
80 Correct 4 ms 4596 KB Output is correct
81 Correct 3 ms 4564 KB Output is correct
82 Correct 3 ms 4564 KB Output is correct
83 Correct 3 ms 4632 KB Output is correct
84 Correct 3 ms 4564 KB Output is correct
85 Correct 4 ms 4564 KB Output is correct
86 Correct 41 ms 6576 KB Output is correct
87 Correct 34 ms 6640 KB Output is correct
88 Correct 38 ms 6704 KB Output is correct
89 Correct 35 ms 6856 KB Output is correct
90 Correct 32 ms 6692 KB Output is correct
91 Correct 30 ms 6604 KB Output is correct
92 Correct 31 ms 6348 KB Output is correct
93 Correct 68 ms 16540 KB Output is correct
94 Correct 60 ms 15740 KB Output is correct
95 Correct 71 ms 16404 KB Output is correct
96 Correct 65 ms 16580 KB Output is correct
97 Correct 93 ms 16500 KB Output is correct
98 Correct 80 ms 16536 KB Output is correct
99 Correct 30 ms 15840 KB Output is correct
100 Correct 143 ms 18380 KB Output is correct
101 Correct 146 ms 18380 KB Output is correct
102 Correct 143 ms 18504 KB Output is correct
103 Correct 111 ms 18100 KB Output is correct
104 Correct 145 ms 17744 KB Output is correct
105 Correct 133 ms 18052 KB Output is correct
106 Correct 139 ms 17704 KB Output is correct
107 Correct 134 ms 17780 KB Output is correct
108 Correct 165 ms 18396 KB Output is correct
109 Correct 139 ms 18336 KB Output is correct
110 Correct 127 ms 18320 KB Output is correct
111 Correct 146 ms 18388 KB Output is correct