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Submission #674499

# Submission time Handle Problem Language Result Execution time Memory
674499 2022-12-24T14:46:04 Z stanislavpolyn Event Hopping (BOI22_events) C++17
100 / 100
 183 ms 17200 KB 
#include <bits/stdc++.h>

#define fr(i, a, b) for (int i = (a); i <= (b); i++)
#define rf(i, a, b) for (int i = (a); i >= (b); i--)
#define fe(x, y) for (auto& x : y)

#define fi first
#define se second
#define pb push_back
#define mp make_pair
#define mt make_tuple

#define pw(x) (1LL << (x))
#define sz(x) (int)(x).size()
#define all(x) (x).begin(), (x).end()

using namespace std;

mt19937_64 rng(chrono::system_clock::now().time_since_epoch().count());

#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
template <typename T>
using oset = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
#define fbo find_by_order
#define ook order_of_key

template <typename T>
bool umn(T& a, T b) {
    return a > b ? a = b, 1 : 0;
}
template <typename T>
bool umx(T& a, T b) {
    return a < b ? a = b, 1 : 0;
}

using ll = long long;
using ld = long double;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
template <typename T>
using ve = vector<T>;

const int N = 1e5 + 5;

int n, q;
ve<pii> a;
int to[N];

int go[N][20];

ve<int> u;

pii t[4 * N];

void upd(int v, int tl, int tr, int pos, int val, int idx) {
    if (tl == tr) {
        umn(t[v], mp(val, idx));
        return;
    }
    int tm = (tl + tr) >> 1;
    if (pos <= tm) upd(v << 1, tl, tm, pos, val, idx);
    else upd(v << 1 | 1, tm + 1, tr, pos, val, idx);
    t[v] = min(t[v << 1], t[v << 1 | 1]);
}

void upd(int pos, int val, int idx) {
    upd(1, 0, sz(u) - 1, pos, val, idx);
}

pii get(int v, int tl, int tr, int l, int r) {
    if (l > r) {
        return mp(int(1e9), 0);
    }
    if (tl == l && tr == r) {
        return t[v];
    }
    int tm = (tl + tr) >> 1;
    return min(get(v << 1, tl, tm, l, min(r, tm)),
               get(v << 1 | 1, tm + 1, tr, max(tm + 1, l), r));
}

pii get(int l, int r) {
    return get(1, 0, sz(u) - 1, l, r);
}

int main() {
#ifndef LOCAL
    // freopen("input.txt", "r", stdin);
    // freopen("output.txt", "w", stdout);
    ios::sync_with_stdio(0);
    cin.tie(0);
#else
    // freopen("input.txt", "r", stdin);
    // freopen("output.txt", "w", stdout);
#endif

    cin >> n >> q;
    a.resize(n + 1);
    fr (i, 1, n) {
        cin >> a[i].fi >> a[i].se;
        // to[i] = i;

        u.pb(a[i].se);
    }

    sort(all(u));
    u.erase(unique(all(u)), u.end());

    fill(t, t + 4 * N, mp(int(1e9), 0));

    fr (i, 1, n) {
        int id = lower_bound(all(u), a[i].se) - u.begin();
        upd(id, a[i].fi, i);
    }

    fr (i, 1, n) {
        int L = lower_bound(all(u), a[i].fi) - u.begin();
        int R = upper_bound(all(u), a[i].se) - u.begin() - 1;
        to[i] = get(L, R).se;
    }

    // fr (i, 1, n) {
    //     fr (j, 1, n) {
    //         if (i == j) continue;

    //         if (a[j].se >= a[i].fi && a[j].se <= a[i].se) {
    //             if (!to[i] || a[to[i]].fi > a[j].fi) {
    //                 to[i] = j;
    //             }
    //         }
    //     }
    // }

    fr (i, 1, n) {
        go[i][0] = to[i];
    }

    fr (p, 1, 19) {
        fr (i, 1, n) {
            go[i][p] = go[go[i][p - 1]][p - 1];
        }
    }

    fr (i, 0, q - 1) {
        int s, e;
        cin >> s >> e;

        if (a[s].se > a[e].se) {
            cout << "impossible\n";
            continue;
        }
        if (s == e) {
            cout << "0\n";
            continue;
        }

        int v = e;
        int ans = 0;
        rf (p, 19, 0) {
            if (go[v][p] && a[go[v][p]].fi > a[s].se) {
                ans += pw(p);
                v = go[v][p];
            }
        }

        if (to[v] && a[v].fi > a[s].se) {
            v = to[v];
            ans++;
        }

        if (a[v].fi <= a[s].se) {
            ans++;
            cout << ans << "\n";
        } else {
            cout << "impossible\n";
        }
    }

    return 0;
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 3412 KB Output is correct
2 Correct 134 ms 14444 KB Output is correct
3 Correct 138 ms 16652 KB Output is correct
4 Correct 175 ms 16772 KB Output is correct
5 Correct 141 ms 16660 KB Output is correct
6 Correct 139 ms 16656 KB Output is correct
7 Correct 143 ms 16780 KB Output is correct
8 Correct 129 ms 17164 KB Output is correct
9 Correct 127 ms 17064 KB Output is correct
10 Correct 144 ms 17040 KB Output is correct
11 Correct 147 ms 17200 KB Output is correct
12 Correct 83 ms 16460 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 3412 KB Output is correct
2 Correct 2 ms 3412 KB Output is correct
3 Correct 2 ms 3540 KB Output is correct
4 Correct 3 ms 3540 KB Output is correct
5 Correct 2 ms 3464 KB Output is correct
6 Correct 3 ms 3540 KB Output is correct
7 Correct 2 ms 3540 KB Output is correct
8 Correct 2 ms 3540 KB Output is correct
9 Correct 2 ms 3540 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 3412 KB Output is correct
2 Correct 2 ms 3412 KB Output is correct
3 Correct 2 ms 3540 KB Output is correct
4 Correct 3 ms 3540 KB Output is correct
5 Correct 2 ms 3464 KB Output is correct
6 Correct 3 ms 3540 KB Output is correct
7 Correct 2 ms 3540 KB Output is correct
8 Correct 2 ms 3540 KB Output is correct
9 Correct 2 ms 3540 KB Output is correct
10 Correct 3 ms 3412 KB Output is correct
11 Correct 2 ms 3412 KB Output is correct
12 Correct 2 ms 3540 KB Output is correct
13 Correct 3 ms 3540 KB Output is correct
14 Correct 3 ms 3540 KB Output is correct
15 Correct 3 ms 3540 KB Output is correct
16 Correct 2 ms 3540 KB Output is correct
17 Correct 2 ms 3540 KB Output is correct
18 Correct 2 ms 3540 KB Output is correct
19 Correct 31 ms 4456 KB Output is correct
20 Correct 30 ms 4360 KB Output is correct
21 Correct 40 ms 4612 KB Output is correct
22 Correct 26 ms 4728 KB Output is correct
23 Correct 29 ms 4572 KB Output is correct
24 Correct 25 ms 4564 KB Output is correct
25 Correct 27 ms 4264 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 3412 KB Output is correct
2 Correct 2 ms 3412 KB Output is correct
3 Correct 2 ms 3540 KB Output is correct
4 Correct 3 ms 3540 KB Output is correct
5 Correct 2 ms 3464 KB Output is correct
6 Correct 3 ms 3540 KB Output is correct
7 Correct 2 ms 3540 KB Output is correct
8 Correct 2 ms 3540 KB Output is correct
9 Correct 2 ms 3540 KB Output is correct
10 Correct 2 ms 3412 KB Output is correct
11 Correct 2 ms 3412 KB Output is correct
12 Correct 2 ms 3540 KB Output is correct
13 Correct 2 ms 3540 KB Output is correct
14 Correct 3 ms 3540 KB Output is correct
15 Correct 3 ms 3540 KB Output is correct
16 Correct 3 ms 3540 KB Output is correct
17 Correct 2 ms 3540 KB Output is correct
18 Correct 2 ms 3540 KB Output is correct
19 Correct 114 ms 12860 KB Output is correct
20 Correct 108 ms 14216 KB Output is correct
21 Correct 108 ms 14716 KB Output is correct
22 Correct 110 ms 14888 KB Output is correct
23 Correct 91 ms 14844 KB Output is correct
24 Correct 123 ms 14836 KB Output is correct
25 Correct 33 ms 14156 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 128 ms 14504 KB Output is correct
2 Correct 135 ms 16640 KB Output is correct
3 Correct 162 ms 16660 KB Output is correct
4 Correct 126 ms 17104 KB Output is correct
5 Correct 149 ms 17120 KB Output is correct
6 Correct 156 ms 16716 KB Output is correct
7 Correct 165 ms 16776 KB Output is correct
8 Correct 140 ms 16944 KB Output is correct
9 Correct 103 ms 14820 KB Output is correct
10 Correct 142 ms 16400 KB Output is correct
11 Correct 137 ms 16240 KB Output is correct
12 Correct 147 ms 16420 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 3412 KB Output is correct
2 Correct 134 ms 14444 KB Output is correct
3 Correct 138 ms 16652 KB Output is correct
4 Correct 175 ms 16772 KB Output is correct
5 Correct 141 ms 16660 KB Output is correct
6 Correct 139 ms 16656 KB Output is correct
7 Correct 143 ms 16780 KB Output is correct
8 Correct 129 ms 17164 KB Output is correct
9 Correct 127 ms 17064 KB Output is correct
10 Correct 144 ms 17040 KB Output is correct
11 Correct 147 ms 17200 KB Output is correct
12 Correct 83 ms 16460 KB Output is correct
13 Correct 2 ms 3412 KB Output is correct
14 Correct 2 ms 3412 KB Output is correct
15 Correct 2 ms 3540 KB Output is correct
16 Correct 3 ms 3540 KB Output is correct
17 Correct 2 ms 3464 KB Output is correct
18 Correct 3 ms 3540 KB Output is correct
19 Correct 2 ms 3540 KB Output is correct
20 Correct 2 ms 3540 KB Output is correct
21 Correct 2 ms 3540 KB Output is correct
22 Correct 3 ms 3412 KB Output is correct
23 Correct 2 ms 3412 KB Output is correct
24 Correct 2 ms 3540 KB Output is correct
25 Correct 3 ms 3540 KB Output is correct
26 Correct 3 ms 3540 KB Output is correct
27 Correct 3 ms 3540 KB Output is correct
28 Correct 2 ms 3540 KB Output is correct
29 Correct 2 ms 3540 KB Output is correct
30 Correct 2 ms 3540 KB Output is correct
31 Correct 31 ms 4456 KB Output is correct
32 Correct 30 ms 4360 KB Output is correct
33 Correct 40 ms 4612 KB Output is correct
34 Correct 26 ms 4728 KB Output is correct
35 Correct 29 ms 4572 KB Output is correct
36 Correct 25 ms 4564 KB Output is correct
37 Correct 27 ms 4264 KB Output is correct
38 Correct 2 ms 3412 KB Output is correct
39 Correct 2 ms 3412 KB Output is correct
40 Correct 2 ms 3540 KB Output is correct
41 Correct 2 ms 3540 KB Output is correct
42 Correct 3 ms 3540 KB Output is correct
43 Correct 3 ms 3540 KB Output is correct
44 Correct 3 ms 3540 KB Output is correct
45 Correct 2 ms 3540 KB Output is correct
46 Correct 2 ms 3540 KB Output is correct
47 Correct 114 ms 12860 KB Output is correct
48 Correct 108 ms 14216 KB Output is correct
49 Correct 108 ms 14716 KB Output is correct
50 Correct 110 ms 14888 KB Output is correct
51 Correct 91 ms 14844 KB Output is correct
52 Correct 123 ms 14836 KB Output is correct
53 Correct 33 ms 14156 KB Output is correct
54 Correct 128 ms 14504 KB Output is correct
55 Correct 135 ms 16640 KB Output is correct
56 Correct 162 ms 16660 KB Output is correct
57 Correct 126 ms 17104 KB Output is correct
58 Correct 149 ms 17120 KB Output is correct
59 Correct 156 ms 16716 KB Output is correct
60 Correct 165 ms 16776 KB Output is correct
61 Correct 140 ms 16944 KB Output is correct
62 Correct 103 ms 14820 KB Output is correct
63 Correct 142 ms 16400 KB Output is correct
64 Correct 137 ms 16240 KB Output is correct
65 Correct 147 ms 16420 KB Output is correct
66 Correct 2 ms 3412 KB Output is correct
67 Correct 131 ms 16652 KB Output is correct
68 Correct 136 ms 16604 KB Output is correct
69 Correct 163 ms 16612 KB Output is correct
70 Correct 145 ms 16656 KB Output is correct
71 Correct 140 ms 16716 KB Output is correct
72 Correct 143 ms 16732 KB Output is correct
73 Correct 130 ms 17172 KB Output is correct
74 Correct 139 ms 17060 KB Output is correct
75 Correct 143 ms 17036 KB Output is correct
76 Correct 148 ms 17052 KB Output is correct
77 Correct 89 ms 16332 KB Output is correct
78 Correct 2 ms 3412 KB Output is correct
79 Correct 3 ms 3540 KB Output is correct
80 Correct 2 ms 3540 KB Output is correct
81 Correct 3 ms 3540 KB Output is correct
82 Correct 3 ms 3540 KB Output is correct
83 Correct 3 ms 3552 KB Output is correct
84 Correct 2 ms 3540 KB Output is correct
85 Correct 2 ms 3540 KB Output is correct
86 Correct 34 ms 5324 KB Output is correct
87 Correct 30 ms 5480 KB Output is correct
88 Correct 37 ms 5708 KB Output is correct
89 Correct 27 ms 5696 KB Output is correct
90 Correct 27 ms 5552 KB Output is correct
91 Correct 26 ms 5588 KB Output is correct
92 Correct 29 ms 5196 KB Output is correct
93 Correct 104 ms 14912 KB Output is correct
94 Correct 101 ms 14068 KB Output is correct
95 Correct 112 ms 14708 KB Output is correct
96 Correct 111 ms 15060 KB Output is correct
97 Correct 97 ms 14844 KB Output is correct
98 Correct 111 ms 14812 KB Output is correct
99 Correct 31 ms 14236 KB Output is correct
100 Correct 151 ms 16792 KB Output is correct
101 Correct 148 ms 16732 KB Output is correct
102 Correct 145 ms 16928 KB Output is correct
103 Correct 145 ms 16396 KB Output is correct
104 Correct 153 ms 16284 KB Output is correct
105 Correct 162 ms 16452 KB Output is correct
106 Correct 143 ms 16064 KB Output is correct
107 Correct 153 ms 16056 KB Output is correct
108 Correct 139 ms 16724 KB Output is correct
109 Correct 138 ms 16724 KB Output is correct
110 Correct 165 ms 16692 KB Output is correct
111 Correct 183 ms 16756 KB Output is correct