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Submission #1080270

# Submission time Handle Problem Language Result Execution time Memory
1080270 2024-08-29T08:30:08 Z anton Fire (BOI24_fire) C++17
100 / 100
 671 ms 86004 KB 
#include<bits/stdc++.h>

using namespace std;
#define pii pair<int, int>

const int MAX_S = 20;
int N, M;
vector<int> times;

vector<vector<int>> calc_bl(vector<int> optimal_next){
    int n = optimal_next.size();
    vector<vector<int>> bl(MAX_S, vector<int>(n));

    for(int i = 0; i<n; i++){
        bl[0][i] = optimal_next[i];
    }
    for(int step =1; step<MAX_S; step++){
        for(int i = 0; i<n; i++){
            bl[step][i] = bl[step-1][bl[step-1][i]];
        }
    }
    return bl;

}

int get_nth(vector<vector<int>>& bl, int pos, int dist){
    for(int i = MAX_S-1; i>=0; i--){
        if((dist&(1LL<<i))!=0LL){
            pos = bl[i][pos];
        }
    }
    return pos;
}
signed main(){
    cin>>N>>M;

    vector<pii> inters;

    for(int i = 0; i<N; i++){
        pii inter;
        cin>>inter.first>>inter.second;
        if(inter.first>inter.second){
            inters.push_back({inter.first, inter.second+M});
        }
        else{
            inters.push_back({inter.first, inter.second});
            inters.push_back({inter.first+M, inter.second+M});
        }
    }

    for(auto inter: inters){
        times.push_back(inter.first);
        times.push_back(inter.second);
    }

    sort(times.begin(), times.end());

    for(pii& e: inters){
        if(e.first<e.second){
            e.first = lower_bound(times.begin(), times.end(), e.first) - times.begin();
            e.second = lower_bound(times.begin(), times.end(), e.second)- times.begin();
        }
    }
    sort(inters.begin(), inters.end());


    vector<pii> ev;
    set<pii> cur_open;

    for(int i = 0; i<inters.size(); i++){
        auto e = inters[i];
        ev.push_back({e.first, i});
    }

    vector<int> opt(times.size());
    sort(ev.begin(), ev.end());
    reverse(ev.begin(), ev.end());
    for(int i = 0; i<times.size(); i++){
        while(ev.size()>0 && ev.back().first==i){
            auto cur_ev = ev.back();
            ev.pop_back();
            cur_open.insert(pii({inters[cur_ev.second].second, cur_ev.second}));
        }
        if(cur_open.size()>0){
            opt[i] = (--cur_open.end())->first;
        }
        while(cur_open.size()>0 && cur_open.begin()->first == i){
            cur_open.erase(cur_open.begin());
        }
    }
    /*for(int i = 0; i<times.size(); i++){
        cout<<times[i]<<" "<<times[opt[i]]<<endl;
    }*/

    auto bl = calc_bl(opt);


    int res =1e6;


    for(int i = 0; i<times.size(); i++){
        int cur_dist = 1e6;

        for(int step = (1<<20); step>=1; step/=2){
            if(cur_dist-step>=0){
                if((times[get_nth(bl, i, cur_dist-step)]-times[i])>=M){
                    cur_dist-=step;
                }
            }
        }
        res = min(res, cur_dist);
    }

    if(res==1e6){
        cout<<-1<<endl;
    }
    else{
        cout<<res<<endl;
    }
    
}

Compilation message

Main.cpp: In function 'int main()':
Main.cpp:70:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   70 |     for(int i = 0; i<inters.size(); i++){
      |                    ~^~~~~~~~~~~~~~
Main.cpp:78:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   78 |     for(int i = 0; i<times.size(); i++){
      |                    ~^~~~~~~~~~~~~
Main.cpp:101:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  101 |     for(int i = 0; i<times.size(); i++){
      |                    ~^~~~~~~~~~~~~

Subtask #1
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 0 ms 432 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 396 KB Output is correct
17 Correct 1 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 0 ms 348 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 1 ms 348 KB Output is correct

Subtask #2
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 0 ms 432 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 396 KB Output is correct
17 Correct 1 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 0 ms 348 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 1 ms 348 KB Output is correct
24 Correct 0 ms 348 KB Output is correct
25 Correct 1 ms 348 KB Output is correct
26 Correct 1 ms 348 KB Output is correct
27 Correct 1 ms 344 KB Output is correct
28 Correct 1 ms 348 KB Output is correct
29 Correct 1 ms 348 KB Output is correct
30 Correct 1 ms 600 KB Output is correct
31 Correct 1 ms 348 KB Output is correct
32 Correct 1 ms 436 KB Output is correct
33 Correct 1 ms 348 KB Output is correct
34 Correct 2 ms 448 KB Output is correct
35 Correct 1 ms 348 KB Output is correct
36 Correct 1 ms 348 KB Output is correct
37 Correct 1 ms 348 KB Output is correct
38 Correct 1 ms 348 KB Output is correct

Subtask #3
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 0 ms 432 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 396 KB Output is correct
17 Correct 1 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 0 ms 348 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 1 ms 348 KB Output is correct
24 Correct 0 ms 348 KB Output is correct
25 Correct 1 ms 348 KB Output is correct
26 Correct 1 ms 348 KB Output is correct
27 Correct 1 ms 344 KB Output is correct
28 Correct 1 ms 348 KB Output is correct
29 Correct 1 ms 348 KB Output is correct
30 Correct 1 ms 600 KB Output is correct
31 Correct 1 ms 348 KB Output is correct
32 Correct 1 ms 436 KB Output is correct
33 Correct 1 ms 348 KB Output is correct
34 Correct 2 ms 448 KB Output is correct
35 Correct 1 ms 348 KB Output is correct
36 Correct 1 ms 348 KB Output is correct
37 Correct 1 ms 348 KB Output is correct
38 Correct 1 ms 348 KB Output is correct
39 Correct 13 ms 2396 KB Output is correct
40 Correct 14 ms 2396 KB Output is correct
41 Correct 13 ms 2364 KB Output is correct
42 Correct 12 ms 2396 KB Output is correct
43 Correct 11 ms 2396 KB Output is correct
44 Correct 13 ms 2396 KB Output is correct
45 Correct 13 ms 2392 KB Output is correct
46 Correct 13 ms 2396 KB Output is correct
47 Correct 12 ms 2440 KB Output is correct
48 Correct 13 ms 2396 KB Output is correct
49 Correct 11 ms 2396 KB Output is correct
50 Correct 13 ms 2396 KB Output is correct

Subtask #4
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 344 KB Output is correct
4 Correct 0 ms 344 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 1 ms 436 KB Output is correct
10 Correct 1 ms 576 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 1 ms 348 KB Output is correct
14 Correct 1 ms 348 KB Output is correct
15 Correct 13 ms 2396 KB Output is correct
16 Correct 13 ms 2396 KB Output is correct
17 Correct 12 ms 2260 KB Output is correct
18 Correct 13 ms 2368 KB Output is correct
19 Correct 14 ms 2396 KB Output is correct
20 Correct 347 ms 64436 KB Output is correct
21 Correct 658 ms 85676 KB Output is correct
22 Correct 652 ms 85848 KB Output is correct
23 Correct 601 ms 84916 KB Output is correct
24 Correct 642 ms 86004 KB Output is correct
25 Correct 643 ms 80560 KB Output is correct
26 Correct 639 ms 85680 KB Output is correct
27 Correct 621 ms 85680 KB Output is correct
28 Correct 615 ms 85676 KB Output is correct

Subtask #5
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 1 ms 344 KB Output is correct
10 Correct 1 ms 348 KB Output is correct
11 Correct 1 ms 344 KB Output is correct
12 Correct 13 ms 2396 KB Output is correct
13 Correct 12 ms 2396 KB Output is correct
14 Correct 12 ms 2548 KB Output is correct
15 Correct 334 ms 64432 KB Output is correct
16 Correct 599 ms 84736 KB Output is correct
17 Correct 637 ms 85676 KB Output is correct
18 Correct 604 ms 82348 KB Output is correct
19 Correct 628 ms 85672 KB Output is correct
20 Correct 613 ms 84748 KB Output is correct

Subtask #6
26.0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 0 ms 432 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 396 KB Output is correct
17 Correct 1 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 0 ms 348 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 1 ms 348 KB Output is correct
24 Correct 0 ms 348 KB Output is correct
25 Correct 1 ms 348 KB Output is correct
26 Correct 1 ms 348 KB Output is correct
27 Correct 1 ms 344 KB Output is correct
28 Correct 1 ms 348 KB Output is correct
29 Correct 1 ms 348 KB Output is correct
30 Correct 1 ms 600 KB Output is correct
31 Correct 1 ms 348 KB Output is correct
32 Correct 1 ms 436 KB Output is correct
33 Correct 1 ms 348 KB Output is correct
34 Correct 2 ms 448 KB Output is correct
35 Correct 1 ms 348 KB Output is correct
36 Correct 1 ms 348 KB Output is correct
37 Correct 1 ms 348 KB Output is correct
38 Correct 1 ms 348 KB Output is correct
39 Correct 13 ms 2396 KB Output is correct
40 Correct 14 ms 2396 KB Output is correct
41 Correct 13 ms 2364 KB Output is correct
42 Correct 12 ms 2396 KB Output is correct
43 Correct 11 ms 2396 KB Output is correct
44 Correct 13 ms 2396 KB Output is correct
45 Correct 13 ms 2392 KB Output is correct
46 Correct 13 ms 2396 KB Output is correct
47 Correct 12 ms 2440 KB Output is correct
48 Correct 13 ms 2396 KB Output is correct
49 Correct 11 ms 2396 KB Output is correct
50 Correct 13 ms 2396 KB Output is correct
51 Correct 0 ms 348 KB Output is correct
52 Correct 0 ms 348 KB Output is correct
53 Correct 0 ms 344 KB Output is correct
54 Correct 0 ms 344 KB Output is correct
55 Correct 0 ms 348 KB Output is correct
56 Correct 0 ms 348 KB Output is correct
57 Correct 0 ms 348 KB Output is correct
58 Correct 0 ms 348 KB Output is correct
59 Correct 1 ms 436 KB Output is correct
60 Correct 1 ms 576 KB Output is correct
61 Correct 1 ms 348 KB Output is correct
62 Correct 1 ms 348 KB Output is correct
63 Correct 1 ms 348 KB Output is correct
64 Correct 1 ms 348 KB Output is correct
65 Correct 13 ms 2396 KB Output is correct
66 Correct 13 ms 2396 KB Output is correct
67 Correct 12 ms 2260 KB Output is correct
68 Correct 13 ms 2368 KB Output is correct
69 Correct 14 ms 2396 KB Output is correct
70 Correct 347 ms 64436 KB Output is correct
71 Correct 658 ms 85676 KB Output is correct
72 Correct 652 ms 85848 KB Output is correct
73 Correct 601 ms 84916 KB Output is correct
74 Correct 642 ms 86004 KB Output is correct
75 Correct 643 ms 80560 KB Output is correct
76 Correct 639 ms 85680 KB Output is correct
77 Correct 621 ms 85680 KB Output is correct
78 Correct 615 ms 85676 KB Output is correct
79 Correct 1 ms 344 KB Output is correct
80 Correct 1 ms 348 KB Output is correct
81 Correct 0 ms 348 KB Output is correct
82 Correct 0 ms 348 KB Output is correct
83 Correct 0 ms 348 KB Output is correct
84 Correct 0 ms 348 KB Output is correct
85 Correct 0 ms 348 KB Output is correct
86 Correct 1 ms 348 KB Output is correct
87 Correct 1 ms 344 KB Output is correct
88 Correct 1 ms 348 KB Output is correct
89 Correct 1 ms 344 KB Output is correct
90 Correct 13 ms 2396 KB Output is correct
91 Correct 12 ms 2396 KB Output is correct
92 Correct 12 ms 2548 KB Output is correct
93 Correct 334 ms 64432 KB Output is correct
94 Correct 599 ms 84736 KB Output is correct
95 Correct 637 ms 85676 KB Output is correct
96 Correct 604 ms 82348 KB Output is correct
97 Correct 628 ms 85672 KB Output is correct
98 Correct 613 ms 84748 KB Output is correct
99 Correct 668 ms 85724 KB Output is correct
100 Correct 671 ms 85932 KB Output is correct
101 Correct 627 ms 85680 KB Output is correct
102 Correct 648 ms 85896 KB Output is correct
103 Correct 618 ms 85892 KB Output is correct
104 Correct 630 ms 85680 KB Output is correct
105 Correct 515 ms 84652 KB Output is correct