oj.uz

Submission #721864

# Submission time Handle Problem Language Result Execution time Memory
721864 2023-04-11T08:02:42 Z sunnat Event Hopping (BOI22_events) C++14
100 / 100
 460 ms 17776 KB 
#include <algorithm>
#include <iostream>
#include <vector>
#include <queue>
#include <cmath>
#include <map>
#include <set>
using namespace std;
vector<int> l, r, si, ids;
vector<vector<int> > parent;
int n, q;
const int psize = 17;
struct Segment_Tree{
    vector<int> t;

    void build(int v, int l, int r){
        if(l == r){
            t[v] = si[l-1];
            return;
        }
        int m = (l + r) >> 1;
        build(v<<1, l, m);
        build(v<<1|1, m+1, r);
        t[v] = ::l[t[v<<1]] <= ::l[t[v<<1|1]] ? t[v<<1] : t[v<<1|1];
    }

    int get(int v, int l, int r, int L, int R){
        if(L == l && R == r) return t[v];
        int m = (l + r) >> 1;
        if(m < L) return get(v<<1|1, m+1, r, L, R);
        if(m >= R) return get(v<<1, l, m, L, R);
        int i = get(v<<1|1, m+1, r, m+1, R);
        int j = get(v<<1, l, m, L, m);
        return ::l[j] <= ::l[i] ? j : i;
    }

    int get(int l, int r){
        return ids[get(1, 1, n, l+1, r+1)];
    }

    void build(){
        t.resize(n<<2);
        build(1, 1, n);
    }
};

int main(){
    cin >> n >> q;
    l.resize(n);
    r.resize(n);
    si.resize(n);
    ids.resize(n);
    parent.resize(n, vector<int>(psize, -1));

    for(int i = 0; i < n; i ++){
        cin >> l[i] >> r[i];
        // r[i] --;
        si[i] = i;
    }
    sort(si.begin(), si.end(), [&](int r, int l){
        return ::r[r] != ::r[l] ? ::r[r] < ::r[l] : ::l[r] < ::l[l];
    });
    
    for(int i = 0; i < n; i ++) ids[si[i]] = i;
    // cout << ids[2] << ' ' << ids[4] << endl;
    Segment_Tree st;
    st.build();
    for(int i = 0, l, r, m; i < n; i ++){
        l = 0;
        r = i;
        while(l < r){
            m = (l + r) >> 1;
            if(::r[si[m]] >= ::l[si[i]]) r = m;
            else l = m + 1;
        }
        l = st.get(l, i);
        if(::l[si[l]] != ::l[si[i]]){
            parent[i][0] = l;
            for(int j = 1; j < psize; j ++){
                if(parent[parent[i][j-1]][j-1] != -1)
                    parent[i][j] = parent[parent[i][j-1]][j-1];
                else break;
            }
        }
    }

    for(int i = 0, u, v, cnt = 0; i < q; i ++){
        cin >> u >> v;
        // cout << u << ' ' << v << ' ';
        u --;
        v --;
        if(u == v){
            cout << "0\n";
            continue;
        }
        if(l[v] <= r[u] && r[u] <= r[v]){
            cout << 1 << '\n';
            continue;
        }
        u = ids[u];
        v = ids[v];
        if(u > v){
            cout << "impossible\n";
            continue;
        }
        cnt = 0;
        for(int i = psize - 1; i >= 0; i --){
            if(parent[v][i] != -1 && l[si[parent[v][i]]] > r[si[u]]){
                cnt += 1<<i;
                v = parent[v][i];
            }
        }
        if(parent[v][0] == -1) cout << "impossible\n";
        else cout << cnt + 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 315 ms 14532 KB Output is correct
3 Correct 322 ms 14608 KB Output is correct
4 Correct 344 ms 14568 KB Output is correct
5 Correct 326 ms 14656 KB Output is correct
6 Correct 338 ms 14924 KB Output is correct
7 Correct 333 ms 14988 KB Output is correct
8 Correct 309 ms 15256 KB Output is correct
9 Correct 271 ms 17776 KB Output is correct
10 Correct 349 ms 17556 KB Output is correct
11 Correct 331 ms 17660 KB Output is correct
12 Correct 245 ms 16972 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 0 ms 212 KB Output is correct
3 Correct 2 ms 340 KB Output is correct
4 Correct 2 ms 468 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 2 ms 340 KB Output is correct
7 Correct 2 ms 340 KB Output is correct
8 Correct 2 ms 340 KB Output is correct
9 Correct 2 ms 340 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 0 ms 212 KB Output is correct
3 Correct 2 ms 340 KB Output is correct
4 Correct 2 ms 468 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 2 ms 340 KB Output is correct
7 Correct 2 ms 340 KB Output is correct
8 Correct 2 ms 340 KB Output is correct
9 Correct 2 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 2 ms 340 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 2 ms 340 KB Output is correct
16 Correct 2 ms 340 KB Output is correct
17 Correct 2 ms 416 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 184 ms 1392 KB Output is correct
20 Correct 180 ms 1360 KB Output is correct
21 Correct 184 ms 1668 KB Output is correct
22 Correct 178 ms 1664 KB Output is correct
23 Correct 183 ms 1664 KB Output is correct
24 Correct 175 ms 1476 KB Output is correct
25 Correct 179 ms 1224 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 0 ms 212 KB Output is correct
3 Correct 2 ms 340 KB Output is correct
4 Correct 2 ms 468 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 2 ms 340 KB Output is correct
7 Correct 2 ms 340 KB Output is correct
8 Correct 2 ms 340 KB Output is correct
9 Correct 2 ms 340 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 2 ms 412 KB Output is correct
13 Correct 2 ms 340 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 2 ms 340 KB Output is correct
16 Correct 2 ms 340 KB Output is correct
17 Correct 2 ms 340 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 124 ms 13696 KB Output is correct
20 Correct 99 ms 13572 KB Output is correct
21 Correct 108 ms 13580 KB Output is correct
22 Correct 120 ms 14624 KB Output is correct
23 Correct 101 ms 13516 KB Output is correct
24 Correct 117 ms 13568 KB Output is correct
25 Correct 71 ms 13580 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 300 ms 14224 KB Output is correct
2 Correct 314 ms 14208 KB Output is correct
3 Correct 343 ms 14092 KB Output is correct
4 Correct 275 ms 14596 KB Output is correct
5 Correct 328 ms 14660 KB Output is correct
6 Correct 357 ms 14756 KB Output is correct
7 Correct 354 ms 14896 KB Output is correct
8 Correct 321 ms 15260 KB Output is correct
9 Correct 100 ms 14244 KB Output is correct
10 Correct 300 ms 14624 KB Output is correct
11 Correct 302 ms 14416 KB Output is correct
12 Correct 303 ms 14656 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 315 ms 14532 KB Output is correct
3 Correct 322 ms 14608 KB Output is correct
4 Correct 344 ms 14568 KB Output is correct
5 Correct 326 ms 14656 KB Output is correct
6 Correct 338 ms 14924 KB Output is correct
7 Correct 333 ms 14988 KB Output is correct
8 Correct 309 ms 15256 KB Output is correct
9 Correct 271 ms 17776 KB Output is correct
10 Correct 349 ms 17556 KB Output is correct
11 Correct 331 ms 17660 KB Output is correct
12 Correct 245 ms 16972 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 0 ms 212 KB Output is correct
15 Correct 2 ms 340 KB Output is correct
16 Correct 2 ms 468 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 2 ms 340 KB Output is correct
19 Correct 2 ms 340 KB Output is correct
20 Correct 2 ms 340 KB Output is correct
21 Correct 2 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 2 ms 340 KB Output is correct
26 Correct 1 ms 340 KB Output is correct
27 Correct 2 ms 340 KB Output is correct
28 Correct 2 ms 340 KB Output is correct
29 Correct 2 ms 416 KB Output is correct
30 Correct 1 ms 340 KB Output is correct
31 Correct 184 ms 1392 KB Output is correct
32 Correct 180 ms 1360 KB Output is correct
33 Correct 184 ms 1668 KB Output is correct
34 Correct 178 ms 1664 KB Output is correct
35 Correct 183 ms 1664 KB Output is correct
36 Correct 175 ms 1476 KB Output is correct
37 Correct 179 ms 1224 KB Output is correct
38 Correct 0 ms 212 KB Output is correct
39 Correct 0 ms 212 KB Output is correct
40 Correct 2 ms 412 KB Output is correct
41 Correct 2 ms 340 KB Output is correct
42 Correct 1 ms 340 KB Output is correct
43 Correct 2 ms 340 KB Output is correct
44 Correct 2 ms 340 KB Output is correct
45 Correct 2 ms 340 KB Output is correct
46 Correct 1 ms 340 KB Output is correct
47 Correct 124 ms 13696 KB Output is correct
48 Correct 99 ms 13572 KB Output is correct
49 Correct 108 ms 13580 KB Output is correct
50 Correct 120 ms 14624 KB Output is correct
51 Correct 101 ms 13516 KB Output is correct
52 Correct 117 ms 13568 KB Output is correct
53 Correct 71 ms 13580 KB Output is correct
54 Correct 300 ms 14224 KB Output is correct
55 Correct 314 ms 14208 KB Output is correct
56 Correct 343 ms 14092 KB Output is correct
57 Correct 275 ms 14596 KB Output is correct
58 Correct 328 ms 14660 KB Output is correct
59 Correct 357 ms 14756 KB Output is correct
60 Correct 354 ms 14896 KB Output is correct
61 Correct 321 ms 15260 KB Output is correct
62 Correct 100 ms 14244 KB Output is correct
63 Correct 300 ms 14624 KB Output is correct
64 Correct 302 ms 14416 KB Output is correct
65 Correct 303 ms 14656 KB Output is correct
66 Correct 1 ms 212 KB Output is correct
67 Correct 361 ms 17324 KB Output is correct
68 Correct 320 ms 17236 KB Output is correct
69 Correct 399 ms 17300 KB Output is correct
70 Correct 333 ms 17280 KB Output is correct
71 Correct 316 ms 17268 KB Output is correct
72 Correct 460 ms 17404 KB Output is correct
73 Correct 271 ms 17720 KB Output is correct
74 Correct 276 ms 17740 KB Output is correct
75 Correct 370 ms 17652 KB Output is correct
76 Correct 362 ms 17660 KB Output is correct
77 Correct 253 ms 17044 KB Output is correct
78 Correct 1 ms 296 KB Output is correct
79 Correct 2 ms 432 KB Output is correct
80 Correct 2 ms 436 KB Output is correct
81 Correct 1 ms 340 KB Output is correct
82 Correct 3 ms 340 KB Output is correct
83 Correct 2 ms 340 KB Output is correct
84 Correct 2 ms 340 KB Output is correct
85 Correct 2 ms 340 KB Output is correct
86 Correct 205 ms 2412 KB Output is correct
87 Correct 249 ms 2408 KB Output is correct
88 Correct 221 ms 2616 KB Output is correct
89 Correct 185 ms 2764 KB Output is correct
90 Correct 193 ms 2512 KB Output is correct
91 Correct 192 ms 2596 KB Output is correct
92 Correct 181 ms 2252 KB Output is correct
93 Correct 128 ms 15552 KB Output is correct
94 Correct 121 ms 14704 KB Output is correct
95 Correct 111 ms 15348 KB Output is correct
96 Correct 114 ms 15480 KB Output is correct
97 Correct 101 ms 15508 KB Output is correct
98 Correct 125 ms 15436 KB Output is correct
99 Correct 75 ms 14796 KB Output is correct
100 Correct 344 ms 17332 KB Output is correct
101 Correct 373 ms 17384 KB Output is correct
102 Correct 311 ms 17560 KB Output is correct
103 Correct 305 ms 17076 KB Output is correct
104 Correct 301 ms 16876 KB Output is correct
105 Correct 310 ms 17140 KB Output is correct
106 Correct 331 ms 16896 KB Output is correct
107 Correct 370 ms 16632 KB Output is correct
108 Correct 300 ms 17356 KB Output is correct
109 Correct 299 ms 17400 KB Output is correct
110 Correct 318 ms 17332 KB Output is correct
111 Correct 308 ms 17324 KB Output is correct