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답안 #599163

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
599163 2022-07-19T11:08:48 Z SlavicG Event Hopping (BOI22_events) C++17
100 / 100
 466 ms 43740 KB 
#include "bits/stdc++.h"
using namespace std;

const int N = 1e6 + 10, K = 23;
int l[N], r[N], n, q;
int jump[N][K];
pair<int, int> t[4 * N];
void modif(int i, int l, int r, int pos, pair<int, int> x) {
    if(l > pos || r < pos) return;
    if(l == pos && r == pos) {
        t[i] = min(t[i], x);
        return;
    }
    int mid = l + r >> 1;
    modif(2 * i, l, mid, pos, x);
    modif(2 * i + 1, mid + 1, r, pos, x);
    t[i] = min(t[2 * i], t[2 * i + 1]);
}
pair<int, int> query(int i, int l, int r, int tl, int tr) {
    if(l > tr || r < tl) return {INT_MAX, -1};
    if(l >= tl && r <= tr) return t[i];
    int mid = l + r >> 1;
    return min(query(2 * i, l, mid, tl, tr), query(2 * i + 1, mid + 1, r, tl, tr));
}

int main() {
    for(int i = 0; i < 4 * N; ++i) t[i] = {INT_MAX, -1};
    vector<int> v;
    cin >> n >> q;
    for(int i = 0; i < n; ++i) {
        cin >> l[i] >> r[i];
        v.push_back(l[i]);
        v.push_back(r[i]);
    }
    sort(v.begin(), v.end());
    v.erase(unique(v.begin(), v.end()), v.end());

    for(int i = 0; i < n; ++i) {
        l[i] = lower_bound(v.begin(), v.end(), l[i]) - v.begin();
        r[i] = lower_bound(v.begin(), v.end(), r[i]) - v.begin();

        modif(1, 0, N - 1, r[i], make_pair(l[i], i));
    }
    for(int i = 0; i < n; ++i) {
        jump[i][0] = query(1, 0, N - 1, l[i], r[i]).second;
    }
    for(int j = 1; j < K; ++j) {
        for(int i = 0; i < n; ++i) {
            jump[i][j] = jump[jump[i][j - 1]][j - 1];
        }
    }

    while(q--) {
        int a, b; cin >> a >> b; --a, --b;
        if(a == b) {
            cout << "0\n";
            continue;
        }
        if(r[a] > r[b]) {
            cout << "impossible\n";
            continue;
        }
        if(r[a] >= l[b]) {
            cout << "1\n";
            continue;
        }
        int ans = 0;
        for(int j = K - 1; j >= 0; --j) {
            if(l[jump[b][j]] > r[a]) {
                b = jump[b][j];
                ans += (1 << j);
            }
        }
        ans += 2;
        b = jump[b][0];
        if(l[b] > r[a]) {
            cout << "impossible\n";
            continue;
        }
        cout << ans << "\n";
    }
}

Compilation message

events.cpp: In function 'void modif(int, int, int, int, std::pair<int, int>)':
events.cpp:14:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   14 |     int mid = l + r >> 1;
      |               ~~^~~
events.cpp: In function 'std::pair<int, int> query(int, int, int, int, int)':
events.cpp:22:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   22 |     int mid = l + r >> 1;
      |               ~~^~~

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 15 ms 31572 KB Output is correct
2 Correct 405 ms 43292 KB Output is correct
3 Correct 360 ms 43176 KB Output is correct
4 Correct 423 ms 43156 KB Output is correct
5 Correct 368 ms 43156 KB Output is correct
6 Correct 374 ms 43228 KB Output is correct
7 Correct 375 ms 43180 KB Output is correct
8 Correct 399 ms 43664 KB Output is correct
9 Correct 382 ms 43592 KB Output is correct
10 Correct 390 ms 43456 KB Output is correct
11 Correct 399 ms 43608 KB Output is correct
12 Correct 308 ms 43640 KB Output is correct

Subtask #2
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 15 ms 31572 KB Output is correct
2 Correct 15 ms 31516 KB Output is correct
3 Correct 16 ms 31668 KB Output is correct
4 Correct 16 ms 31640 KB Output is correct
5 Correct 16 ms 31700 KB Output is correct
6 Correct 19 ms 31652 KB Output is correct
7 Correct 18 ms 31700 KB Output is correct
8 Correct 19 ms 31752 KB Output is correct
9 Correct 17 ms 31752 KB Output is correct

Subtask #3
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 15 ms 31572 KB Output is correct
2 Correct 15 ms 31516 KB Output is correct
3 Correct 16 ms 31668 KB Output is correct
4 Correct 16 ms 31640 KB Output is correct
5 Correct 16 ms 31700 KB Output is correct
6 Correct 19 ms 31652 KB Output is correct
7 Correct 18 ms 31700 KB Output is correct
8 Correct 19 ms 31752 KB Output is correct
9 Correct 17 ms 31752 KB Output is correct
10 Correct 15 ms 31516 KB Output is correct
11 Correct 15 ms 31596 KB Output is correct
12 Correct 16 ms 31700 KB Output is correct
13 Correct 17 ms 31700 KB Output is correct
14 Correct 16 ms 31672 KB Output is correct
15 Correct 17 ms 31736 KB Output is correct
16 Correct 17 ms 31740 KB Output is correct
17 Correct 20 ms 31700 KB Output is correct
18 Correct 17 ms 31676 KB Output is correct
19 Correct 234 ms 32920 KB Output is correct
20 Correct 195 ms 32904 KB Output is correct
21 Correct 235 ms 33228 KB Output is correct
22 Correct 196 ms 33316 KB Output is correct
23 Correct 188 ms 33096 KB Output is correct
24 Correct 198 ms 33100 KB Output is correct
25 Correct 227 ms 32740 KB Output is correct

Subtask #4
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 15 ms 31572 KB Output is correct
2 Correct 15 ms 31516 KB Output is correct
3 Correct 16 ms 31668 KB Output is correct
4 Correct 16 ms 31640 KB Output is correct
5 Correct 16 ms 31700 KB Output is correct
6 Correct 19 ms 31652 KB Output is correct
7 Correct 18 ms 31700 KB Output is correct
8 Correct 19 ms 31752 KB Output is correct
9 Correct 17 ms 31752 KB Output is correct
10 Correct 14 ms 31572 KB Output is correct
11 Correct 14 ms 31596 KB Output is correct
12 Correct 16 ms 31660 KB Output is correct
13 Correct 19 ms 31692 KB Output is correct
14 Correct 16 ms 31640 KB Output is correct
15 Correct 32 ms 31820 KB Output is correct
16 Correct 18 ms 31656 KB Output is correct
17 Correct 18 ms 31692 KB Output is correct
18 Correct 18 ms 31720 KB Output is correct
19 Correct 189 ms 42560 KB Output is correct
20 Correct 166 ms 42576 KB Output is correct
21 Correct 204 ms 42624 KB Output is correct
22 Correct 212 ms 42468 KB Output is correct
23 Correct 209 ms 42644 KB Output is correct
24 Correct 258 ms 42596 KB Output is correct
25 Correct 123 ms 42500 KB Output is correct

Subtask #5
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 371 ms 43128 KB Output is correct
2 Correct 405 ms 43096 KB Output is correct
3 Correct 415 ms 43048 KB Output is correct
4 Correct 429 ms 43596 KB Output is correct
5 Correct 415 ms 43628 KB Output is correct
6 Correct 398 ms 43292 KB Output is correct
7 Correct 429 ms 43204 KB Output is correct
8 Correct 386 ms 43420 KB Output is correct
9 Correct 222 ms 42524 KB Output is correct
10 Correct 393 ms 43100 KB Output is correct
11 Correct 396 ms 42764 KB Output is correct
12 Correct 383 ms 42948 KB Output is correct

Subtask #6
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 15 ms 31572 KB Output is correct
2 Correct 405 ms 43292 KB Output is correct
3 Correct 360 ms 43176 KB Output is correct
4 Correct 423 ms 43156 KB Output is correct
5 Correct 368 ms 43156 KB Output is correct
6 Correct 374 ms 43228 KB Output is correct
7 Correct 375 ms 43180 KB Output is correct
8 Correct 399 ms 43664 KB Output is correct
9 Correct 382 ms 43592 KB Output is correct
10 Correct 390 ms 43456 KB Output is correct
11 Correct 399 ms 43608 KB Output is correct
12 Correct 308 ms 43640 KB Output is correct
13 Correct 15 ms 31572 KB Output is correct
14 Correct 15 ms 31516 KB Output is correct
15 Correct 16 ms 31668 KB Output is correct
16 Correct 16 ms 31640 KB Output is correct
17 Correct 16 ms 31700 KB Output is correct
18 Correct 19 ms 31652 KB Output is correct
19 Correct 18 ms 31700 KB Output is correct
20 Correct 19 ms 31752 KB Output is correct
21 Correct 17 ms 31752 KB Output is correct
22 Correct 15 ms 31516 KB Output is correct
23 Correct 15 ms 31596 KB Output is correct
24 Correct 16 ms 31700 KB Output is correct
25 Correct 17 ms 31700 KB Output is correct
26 Correct 16 ms 31672 KB Output is correct
27 Correct 17 ms 31736 KB Output is correct
28 Correct 17 ms 31740 KB Output is correct
29 Correct 20 ms 31700 KB Output is correct
30 Correct 17 ms 31676 KB Output is correct
31 Correct 234 ms 32920 KB Output is correct
32 Correct 195 ms 32904 KB Output is correct
33 Correct 235 ms 33228 KB Output is correct
34 Correct 196 ms 33316 KB Output is correct
35 Correct 188 ms 33096 KB Output is correct
36 Correct 198 ms 33100 KB Output is correct
37 Correct 227 ms 32740 KB Output is correct
38 Correct 14 ms 31572 KB Output is correct
39 Correct 14 ms 31596 KB Output is correct
40 Correct 16 ms 31660 KB Output is correct
41 Correct 19 ms 31692 KB Output is correct
42 Correct 16 ms 31640 KB Output is correct
43 Correct 32 ms 31820 KB Output is correct
44 Correct 18 ms 31656 KB Output is correct
45 Correct 18 ms 31692 KB Output is correct
46 Correct 18 ms 31720 KB Output is correct
47 Correct 189 ms 42560 KB Output is correct
48 Correct 166 ms 42576 KB Output is correct
49 Correct 204 ms 42624 KB Output is correct
50 Correct 212 ms 42468 KB Output is correct
51 Correct 209 ms 42644 KB Output is correct
52 Correct 258 ms 42596 KB Output is correct
53 Correct 123 ms 42500 KB Output is correct
54 Correct 371 ms 43128 KB Output is correct
55 Correct 405 ms 43096 KB Output is correct
56 Correct 415 ms 43048 KB Output is correct
57 Correct 429 ms 43596 KB Output is correct
58 Correct 415 ms 43628 KB Output is correct
59 Correct 398 ms 43292 KB Output is correct
60 Correct 429 ms 43204 KB Output is correct
61 Correct 386 ms 43420 KB Output is correct
62 Correct 222 ms 42524 KB Output is correct
63 Correct 393 ms 43100 KB Output is correct
64 Correct 396 ms 42764 KB Output is correct
65 Correct 383 ms 42948 KB Output is correct
66 Correct 15 ms 31572 KB Output is correct
67 Correct 391 ms 43096 KB Output is correct
68 Correct 368 ms 43152 KB Output is correct
69 Correct 466 ms 43176 KB Output is correct
70 Correct 418 ms 43152 KB Output is correct
71 Correct 395 ms 43332 KB Output is correct
72 Correct 424 ms 43224 KB Output is correct
73 Correct 385 ms 43740 KB Output is correct
74 Correct 381 ms 43668 KB Output is correct
75 Correct 404 ms 43568 KB Output is correct
76 Correct 411 ms 43584 KB Output is correct
77 Correct 314 ms 43652 KB Output is correct
78 Correct 19 ms 31528 KB Output is correct
79 Correct 17 ms 31700 KB Output is correct
80 Correct 18 ms 31668 KB Output is correct
81 Correct 18 ms 31752 KB Output is correct
82 Correct 19 ms 31644 KB Output is correct
83 Correct 17 ms 31656 KB Output is correct
84 Correct 18 ms 31712 KB Output is correct
85 Correct 16 ms 31712 KB Output is correct
86 Correct 198 ms 33036 KB Output is correct
87 Correct 196 ms 32896 KB Output is correct
88 Correct 202 ms 33240 KB Output is correct
89 Correct 193 ms 33168 KB Output is correct
90 Correct 193 ms 33004 KB Output is correct
91 Correct 189 ms 33080 KB Output is correct
92 Correct 194 ms 32640 KB Output is correct
93 Correct 184 ms 42528 KB Output is correct
94 Correct 201 ms 42496 KB Output is correct
95 Correct 212 ms 42540 KB Output is correct
96 Correct 212 ms 42544 KB Output is correct
97 Correct 211 ms 42584 KB Output is correct
98 Correct 213 ms 42480 KB Output is correct
99 Correct 121 ms 42584 KB Output is correct
100 Correct 440 ms 43308 KB Output is correct
101 Correct 432 ms 43344 KB Output is correct
102 Correct 428 ms 43444 KB Output is correct
103 Correct 391 ms 42956 KB Output is correct
104 Correct 409 ms 42744 KB Output is correct
105 Correct 391 ms 43088 KB Output is correct
106 Correct 362 ms 43196 KB Output is correct
107 Correct 406 ms 43460 KB Output is correct
108 Correct 382 ms 43304 KB Output is correct
109 Correct 399 ms 43384 KB Output is correct
110 Correct 402 ms 43196 KB Output is correct
111 Correct 429 ms 43212 KB Output is correct