oj.uz

Submission #581141

# Submission time Handle Problem Language Result Execution time Memory
581141 2022-06-22T09:37:01 Z KoD Event Hopping (BOI22_events) C++17
100 / 100
 164 ms 11616 KB 
#include <bits/stdc++.h>

using ll = long long;
using std::vector;
using std::array;
using std::tuple;
using std::pair;

template <class F> struct fixed : private F {
    explicit fixed(F&& f) : F(std::forward<F>(f)) {}
    template <class... Args> decltype(auto) operator()(Args&&... args) const {
        return F::operator()(*this, std::forward<Args>(args)...);
    }
};

template <class T>
constexpr T infty = std::numeric_limits<T>::max() / 2;

constexpr pair<int, int> unit = {infty<int>, infty<int>};

class segtree {
    int size;
    vector<pair<int, int>> data;

  public:
    explicit segtree(const int n) : size(n), data(2 * n, unit) {}
    
    void assign(int i, const pair<int, int>& x) {
        i += size;
        data[i] = x;
        while (i > 1) {
            i >>= 1;
            data[i] = std::min(data[2 * i], data[2 * i + 1]);
        }
    }

    pair<int, int> fold(int l, int r) {
        l += size;
        r += size;
        auto ret = unit;
        while (l < r) {
            if (l & 1) ret = std::min(ret, data[l++]);
            if (r & 1) ret = std::min(ret, data[--r]);
            l >>= 1;
            r >>= 1;
        }
        return ret;
    }
};

int main() {
    std::ios_base::sync_with_stdio(false);
    std::cin.tie(nullptr);
    int N, Q;
    std::cin >> N >> Q;
    vector<int> S(N), E(N);
    for (int i = 0; i < N; ++i) {
        std::cin >> S[i] >> E[i];
    }
    vector<pair<int, int>> vec(N);
    for (int i = 0; i < N; ++i) {
        vec[i] = {E[i], i};
    }
    std::sort(vec.begin(), vec.end());
    segtree seg(N);
    for (int i = 0; i < N; ++i) {
        const int k = vec[i].second;
        seg.assign(i, pair(S[k], k));
    }
    constexpr int LOG = 18;
    array<vector<int>, LOG> parent = {};
    parent[0].resize(N);
    for (int i = 0; i < N; ++i) {
        const int l = std::lower_bound(vec.begin(), vec.end(), pair(S[i], 0)) - vec.begin();
        const int r = std::lower_bound(vec.begin(), vec.end(), pair(E[i] + 1, 0)) - vec.begin();
        parent[0][i] = seg.fold(l, r).second;
    }
    for (int i = 0; i < LOG - 1; ++i) {
        parent[i + 1].resize(N);
        for (int j = 0; j < N; ++j) {
            parent[i + 1][j] = parent[i][parent[i][j]];
        }
    }
    while (Q--) {
        int s, e;
        std::cin >> s >> e;
        s -= 1, e -= 1;
        const int root = parent[LOG - 1][e];
        if (s == e) {
            std::cout << 0 << '\n';
            continue;
        }
        if (E[e] < E[s] or E[s] < S[root]) {
            std::cout << "impossible\n";
            continue;
        }
        if (S[e] <= E[s]) {
            std::cout << 1 << '\n';
            continue;
        }
        int ans = 0;
        for (int k = LOG - 1; k >= 0; --k) {
            if (E[s] < S[parent[k][e]]) {
                e = parent[k][e];
                ans |= 1 << k;
            }
        }
        std::cout << ans + 2 << '\n';
    }
    return 0;
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 87 ms 11092 KB Output is correct
3 Correct 98 ms 11008 KB Output is correct
4 Correct 163 ms 11108 KB Output is correct
5 Correct 103 ms 11132 KB Output is correct
6 Correct 100 ms 11076 KB Output is correct
7 Correct 120 ms 11120 KB Output is correct
8 Correct 82 ms 11524 KB Output is correct
9 Correct 89 ms 11616 KB Output is correct
10 Correct 104 ms 11480 KB Output is correct
11 Correct 110 ms 11516 KB Output is correct
12 Correct 55 ms 11604 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 2 ms 340 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 33 ms 1236 KB Output is correct
20 Correct 42 ms 1204 KB Output is correct
21 Correct 33 ms 1524 KB Output is correct
22 Correct 32 ms 1644 KB Output is correct
23 Correct 31 ms 1464 KB Output is correct
24 Correct 31 ms 1336 KB Output is correct
25 Correct 30 ms 1032 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 2 ms 384 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 61 ms 10448 KB Output is correct
20 Correct 70 ms 10492 KB Output is correct
21 Correct 70 ms 10464 KB Output is correct
22 Correct 63 ms 10508 KB Output is correct
23 Correct 69 ms 10500 KB Output is correct
24 Correct 74 ms 10448 KB Output is correct
25 Correct 43 ms 10500 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 87 ms 11004 KB Output is correct
2 Correct 105 ms 11096 KB Output is correct
3 Correct 149 ms 11080 KB Output is correct
4 Correct 89 ms 11608 KB Output is correct
5 Correct 124 ms 11476 KB Output is correct
6 Correct 121 ms 11252 KB Output is correct
7 Correct 161 ms 11272 KB Output is correct
8 Correct 126 ms 11364 KB Output is correct
9 Correct 58 ms 10496 KB Output is correct
10 Correct 121 ms 10808 KB Output is correct
11 Correct 116 ms 10652 KB Output is correct
12 Correct 112 ms 10880 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 87 ms 11092 KB Output is correct
3 Correct 98 ms 11008 KB Output is correct
4 Correct 163 ms 11108 KB Output is correct
5 Correct 103 ms 11132 KB Output is correct
6 Correct 100 ms 11076 KB Output is correct
7 Correct 120 ms 11120 KB Output is correct
8 Correct 82 ms 11524 KB Output is correct
9 Correct 89 ms 11616 KB Output is correct
10 Correct 104 ms 11480 KB Output is correct
11 Correct 110 ms 11516 KB Output is correct
12 Correct 55 ms 11604 KB Output is correct
13 Correct 0 ms 212 KB Output is correct
14 Correct 0 ms 212 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 1 ms 340 KB Output is correct
20 Correct 1 ms 340 KB Output is correct
21 Correct 1 ms 340 KB Output is correct
22 Correct 1 ms 212 KB Output is correct
23 Correct 1 ms 212 KB Output is correct
24 Correct 2 ms 340 KB Output is correct
25 Correct 1 ms 340 KB Output is correct
26 Correct 1 ms 340 KB Output is correct
27 Correct 1 ms 340 KB Output is correct
28 Correct 1 ms 340 KB Output is correct
29 Correct 1 ms 340 KB Output is correct
30 Correct 1 ms 340 KB Output is correct
31 Correct 33 ms 1236 KB Output is correct
32 Correct 42 ms 1204 KB Output is correct
33 Correct 33 ms 1524 KB Output is correct
34 Correct 32 ms 1644 KB Output is correct
35 Correct 31 ms 1464 KB Output is correct
36 Correct 31 ms 1336 KB Output is correct
37 Correct 30 ms 1032 KB Output is correct
38 Correct 1 ms 212 KB Output is correct
39 Correct 1 ms 212 KB Output is correct
40 Correct 1 ms 340 KB Output is correct
41 Correct 2 ms 384 KB Output is correct
42 Correct 1 ms 340 KB Output is correct
43 Correct 1 ms 340 KB Output is correct
44 Correct 1 ms 340 KB Output is correct
45 Correct 1 ms 340 KB Output is correct
46 Correct 1 ms 340 KB Output is correct
47 Correct 61 ms 10448 KB Output is correct
48 Correct 70 ms 10492 KB Output is correct
49 Correct 70 ms 10464 KB Output is correct
50 Correct 63 ms 10508 KB Output is correct
51 Correct 69 ms 10500 KB Output is correct
52 Correct 74 ms 10448 KB Output is correct
53 Correct 43 ms 10500 KB Output is correct
54 Correct 87 ms 11004 KB Output is correct
55 Correct 105 ms 11096 KB Output is correct
56 Correct 149 ms 11080 KB Output is correct
57 Correct 89 ms 11608 KB Output is correct
58 Correct 124 ms 11476 KB Output is correct
59 Correct 121 ms 11252 KB Output is correct
60 Correct 161 ms 11272 KB Output is correct
61 Correct 126 ms 11364 KB Output is correct
62 Correct 58 ms 10496 KB Output is correct
63 Correct 121 ms 10808 KB Output is correct
64 Correct 116 ms 10652 KB Output is correct
65 Correct 112 ms 10880 KB Output is correct
66 Correct 0 ms 212 KB Output is correct
67 Correct 85 ms 11128 KB Output is correct
68 Correct 133 ms 11080 KB Output is correct
69 Correct 164 ms 11012 KB Output is correct
70 Correct 109 ms 11144 KB Output is correct
71 Correct 109 ms 11136 KB Output is correct
72 Correct 105 ms 11124 KB Output is correct
73 Correct 82 ms 11528 KB Output is correct
74 Correct 78 ms 11520 KB Output is correct
75 Correct 109 ms 11492 KB Output is correct
76 Correct 106 ms 11516 KB Output is correct
77 Correct 58 ms 11612 KB Output is correct
78 Correct 0 ms 212 KB Output is correct
79 Correct 1 ms 340 KB Output is correct
80 Correct 1 ms 340 KB Output is correct
81 Correct 1 ms 340 KB Output is correct
82 Correct 1 ms 340 KB Output is correct
83 Correct 1 ms 340 KB Output is correct
84 Correct 1 ms 340 KB Output is correct
85 Correct 1 ms 340 KB Output is correct
86 Correct 33 ms 1248 KB Output is correct
87 Correct 32 ms 1228 KB Output is correct
88 Correct 34 ms 1524 KB Output is correct
89 Correct 31 ms 1620 KB Output is correct
90 Correct 24 ms 1364 KB Output is correct
91 Correct 22 ms 1468 KB Output is correct
92 Correct 26 ms 1088 KB Output is correct
93 Correct 57 ms 10576 KB Output is correct
94 Correct 55 ms 10572 KB Output is correct
95 Correct 77 ms 10468 KB Output is correct
96 Correct 64 ms 10444 KB Output is correct
97 Correct 62 ms 10456 KB Output is correct
98 Correct 67 ms 10460 KB Output is correct
99 Correct 37 ms 10456 KB Output is correct
100 Correct 112 ms 11280 KB Output is correct
101 Correct 117 ms 11236 KB Output is correct
102 Correct 117 ms 11340 KB Output is correct
103 Correct 115 ms 10824 KB Output is correct
104 Correct 107 ms 10708 KB Output is correct
105 Correct 118 ms 10852 KB Output is correct
106 Correct 119 ms 11212 KB Output is correct
107 Correct 119 ms 11348 KB Output is correct
108 Correct 124 ms 11340 KB Output is correct
109 Correct 103 ms 11272 KB Output is correct
110 Correct 118 ms 11136 KB Output is correct
111 Correct 130 ms 11064 KB Output is correct