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Submission #727868

# Submission time Handle Problem Language Result Execution time Memory
727868 2023-04-21T13:48:35 Z Charizard2021 Event Hopping (BOI22_events) C++17
100 / 100
 369 ms 26192 KB 
#include <bits/stdc++.h>
using namespace std;
int main() {
    int n, q;
    cin >> n >> q;
    vector<vector<int> > dp(17, vector<int>(n));
    vector<vector<pair<int, int> > > sparseTables(17, vector<pair<int, int> >(n, make_pair(1000000001, -1)));
    vector<pair<int, int> > a(n);
    vector<int> b;
    for (int i = 0; i < n; i++) {
        cin >> a[i].first >> a[i].second;
        b.push_back(a[i].second);
    }
    sort(b.begin(), b.end());
    b.erase(unique(b.begin(), b.end()), b.end());
    for (int i = 0; i < n; i++) {
        int right = lower_bound(b.begin(), b.end(), a[i].second) - b.begin();
        sparseTables[0][right] = min(sparseTables[0][right], make_pair(a[i].first, i));
    }
    for (int i = 0; i + 1 < 17; i++){
        for (int j = 0; j + (1 << (i + 1)) <= n; j++){
            sparseTables[i + 1][j] = min(sparseTables[i][j], sparseTables[i][j + (1 << i)]);
        }
    }
    for (int i = 0; i < n; i++){
        int left = lower_bound(b.begin(), b.end(), a[i].first) - b.begin();
        int right = lower_bound(b.begin(), b.end(), a[i].second) - b.begin();
        int h = 31 - __builtin_clz(right - left + 1);
        dp[0][i] = min(sparseTables[h][left], sparseTables[h][right + 1 - (1 << h)]).second;
    }
    for (int i = 0; i + 1 < 17; i++){
        for (int j = 0; j < n; j++){
            dp[i + 1][j] = dp[i][dp[i][j]];
        }
    }
    while (q--) {
        int x, y;
        int left = 1;
        cin >> x >> y;
        x--;
        y--;
        if (x == y || (a[y].first <= a[x].second && a[x].second <= a[y].second)) {
            cout << (x == y ? 0 : 1) << "\n";
            continue;
        }
        for (int i = 17 - 1; ~i; i--) {
            if (a[x].second < a[dp[i][y]].first){
                left += 1 << i, y = dp[i][y];
            }
        }
        y = dp[0][y];
        if (a[x].second < a[y].first || a[x].second > a[y].second){
            cout << "impossible\n";
        }
        else{
            cout << left + (a[x].second >= a[y].first) << "\n";
        }
    }
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 320 ms 25676 KB Output is correct
3 Correct 326 ms 25656 KB Output is correct
4 Correct 356 ms 25628 KB Output is correct
5 Correct 328 ms 25720 KB Output is correct
6 Correct 334 ms 25708 KB Output is correct
7 Correct 330 ms 25736 KB Output is correct
8 Correct 350 ms 26172 KB Output is correct
9 Correct 337 ms 26164 KB Output is correct
10 Correct 338 ms 26136 KB Output is correct
11 Correct 364 ms 26068 KB Output is correct
12 Correct 275 ms 25364 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 2 ms 444 KB Output is correct
4 Correct 2 ms 468 KB Output is correct
5 Correct 1 ms 468 KB Output is correct
6 Correct 2 ms 436 KB Output is correct
7 Correct 2 ms 468 KB Output is correct
8 Correct 2 ms 468 KB Output is correct
9 Correct 1 ms 468 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 2 ms 444 KB Output is correct
4 Correct 2 ms 468 KB Output is correct
5 Correct 1 ms 468 KB Output is correct
6 Correct 2 ms 436 KB Output is correct
7 Correct 2 ms 468 KB Output is correct
8 Correct 2 ms 468 KB Output is correct
9 Correct 1 ms 468 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 468 KB Output is correct
13 Correct 2 ms 436 KB Output is correct
14 Correct 2 ms 468 KB Output is correct
15 Correct 2 ms 440 KB Output is correct
16 Correct 2 ms 436 KB Output is correct
17 Correct 2 ms 468 KB Output is correct
18 Correct 2 ms 468 KB Output is correct
19 Correct 186 ms 2860 KB Output is correct
20 Correct 190 ms 2896 KB Output is correct
21 Correct 184 ms 3048 KB Output is correct
22 Correct 183 ms 3100 KB Output is correct
23 Correct 177 ms 3200 KB Output is correct
24 Correct 182 ms 3048 KB Output is correct
25 Correct 175 ms 2700 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 2 ms 444 KB Output is correct
4 Correct 2 ms 468 KB Output is correct
5 Correct 1 ms 468 KB Output is correct
6 Correct 2 ms 436 KB Output is correct
7 Correct 2 ms 468 KB Output is correct
8 Correct 2 ms 468 KB Output is correct
9 Correct 1 ms 468 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 300 KB Output is correct
12 Correct 2 ms 468 KB Output is correct
13 Correct 2 ms 468 KB Output is correct
14 Correct 2 ms 468 KB Output is correct
15 Correct 2 ms 436 KB Output is correct
16 Correct 2 ms 468 KB Output is correct
17 Correct 2 ms 468 KB Output is correct
18 Correct 2 ms 468 KB Output is correct
19 Correct 135 ms 23908 KB Output is correct
20 Correct 106 ms 23136 KB Output is correct
21 Correct 122 ms 23776 KB Output is correct
22 Correct 128 ms 23892 KB Output is correct
23 Correct 123 ms 23948 KB Output is correct
24 Correct 128 ms 23860 KB Output is correct
25 Correct 69 ms 23264 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 314 ms 25732 KB Output is correct
2 Correct 322 ms 25652 KB Output is correct
3 Correct 360 ms 25684 KB Output is correct
4 Correct 323 ms 26148 KB Output is correct
5 Correct 342 ms 26004 KB Output is correct
6 Correct 345 ms 25836 KB Output is correct
7 Correct 341 ms 25908 KB Output is correct
8 Correct 319 ms 25892 KB Output is correct
9 Correct 119 ms 23916 KB Output is correct
10 Correct 322 ms 25480 KB Output is correct
11 Correct 308 ms 25212 KB Output is correct
12 Correct 322 ms 25484 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 320 ms 25676 KB Output is correct
3 Correct 326 ms 25656 KB Output is correct
4 Correct 356 ms 25628 KB Output is correct
5 Correct 328 ms 25720 KB Output is correct
6 Correct 334 ms 25708 KB Output is correct
7 Correct 330 ms 25736 KB Output is correct
8 Correct 350 ms 26172 KB Output is correct
9 Correct 337 ms 26164 KB Output is correct
10 Correct 338 ms 26136 KB Output is correct
11 Correct 364 ms 26068 KB Output is correct
12 Correct 275 ms 25364 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 1 ms 212 KB Output is correct
15 Correct 2 ms 444 KB Output is correct
16 Correct 2 ms 468 KB Output is correct
17 Correct 1 ms 468 KB Output is correct
18 Correct 2 ms 436 KB Output is correct
19 Correct 2 ms 468 KB Output is correct
20 Correct 2 ms 468 KB Output is correct
21 Correct 1 ms 468 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 468 KB Output is correct
25 Correct 2 ms 436 KB Output is correct
26 Correct 2 ms 468 KB Output is correct
27 Correct 2 ms 440 KB Output is correct
28 Correct 2 ms 436 KB Output is correct
29 Correct 2 ms 468 KB Output is correct
30 Correct 2 ms 468 KB Output is correct
31 Correct 186 ms 2860 KB Output is correct
32 Correct 190 ms 2896 KB Output is correct
33 Correct 184 ms 3048 KB Output is correct
34 Correct 183 ms 3100 KB Output is correct
35 Correct 177 ms 3200 KB Output is correct
36 Correct 182 ms 3048 KB Output is correct
37 Correct 175 ms 2700 KB Output is correct
38 Correct 1 ms 212 KB Output is correct
39 Correct 1 ms 300 KB Output is correct
40 Correct 2 ms 468 KB Output is correct
41 Correct 2 ms 468 KB Output is correct
42 Correct 2 ms 468 KB Output is correct
43 Correct 2 ms 436 KB Output is correct
44 Correct 2 ms 468 KB Output is correct
45 Correct 2 ms 468 KB Output is correct
46 Correct 2 ms 468 KB Output is correct
47 Correct 135 ms 23908 KB Output is correct
48 Correct 106 ms 23136 KB Output is correct
49 Correct 122 ms 23776 KB Output is correct
50 Correct 128 ms 23892 KB Output is correct
51 Correct 123 ms 23948 KB Output is correct
52 Correct 128 ms 23860 KB Output is correct
53 Correct 69 ms 23264 KB Output is correct
54 Correct 314 ms 25732 KB Output is correct
55 Correct 322 ms 25652 KB Output is correct
56 Correct 360 ms 25684 KB Output is correct
57 Correct 323 ms 26148 KB Output is correct
58 Correct 342 ms 26004 KB Output is correct
59 Correct 345 ms 25836 KB Output is correct
60 Correct 341 ms 25908 KB Output is correct
61 Correct 319 ms 25892 KB Output is correct
62 Correct 119 ms 23916 KB Output is correct
63 Correct 322 ms 25480 KB Output is correct
64 Correct 308 ms 25212 KB Output is correct
65 Correct 322 ms 25484 KB Output is correct
66 Correct 1 ms 212 KB Output is correct
67 Correct 314 ms 25672 KB Output is correct
68 Correct 328 ms 25596 KB Output is correct
69 Correct 369 ms 25648 KB Output is correct
70 Correct 330 ms 25788 KB Output is correct
71 Correct 325 ms 25792 KB Output is correct
72 Correct 331 ms 25772 KB Output is correct
73 Correct 328 ms 26192 KB Output is correct
74 Correct 333 ms 26108 KB Output is correct
75 Correct 342 ms 26076 KB Output is correct
76 Correct 361 ms 26084 KB Output is correct
77 Correct 264 ms 25424 KB Output is correct
78 Correct 1 ms 212 KB Output is correct
79 Correct 2 ms 468 KB Output is correct
80 Correct 2 ms 468 KB Output is correct
81 Correct 2 ms 468 KB Output is correct
82 Correct 2 ms 468 KB Output is correct
83 Correct 2 ms 436 KB Output is correct
84 Correct 2 ms 468 KB Output is correct
85 Correct 1 ms 468 KB Output is correct
86 Correct 188 ms 2804 KB Output is correct
87 Correct 187 ms 3012 KB Output is correct
88 Correct 187 ms 3132 KB Output is correct
89 Correct 181 ms 3120 KB Output is correct
90 Correct 179 ms 3080 KB Output is correct
91 Correct 181 ms 3068 KB Output is correct
92 Correct 190 ms 2664 KB Output is correct
93 Correct 131 ms 23880 KB Output is correct
94 Correct 109 ms 23160 KB Output is correct
95 Correct 125 ms 23772 KB Output is correct
96 Correct 136 ms 23940 KB Output is correct
97 Correct 118 ms 23948 KB Output is correct
98 Correct 139 ms 23864 KB Output is correct
99 Correct 72 ms 23248 KB Output is correct
100 Correct 350 ms 25856 KB Output is correct
101 Correct 342 ms 25892 KB Output is correct
102 Correct 326 ms 25956 KB Output is correct
103 Correct 340 ms 25556 KB Output is correct
104 Correct 308 ms 25192 KB Output is correct
105 Correct 325 ms 25456 KB Output is correct
106 Correct 328 ms 25060 KB Output is correct
107 Correct 363 ms 25268 KB Output is correct
108 Correct 323 ms 25736 KB Output is correct
109 Correct 334 ms 25864 KB Output is correct
110 Correct 334 ms 25736 KB Output is correct
111 Correct 324 ms 25784 KB Output is correct