oj.uz

Submission #1080314

# Submission time Handle Problem Language Result Execution time Memory
1080314 2024-08-29T08:48:10 Z raphaelp Fire (BOI24_fire) C++14
0 / 100
 1 ms 392 KB 
#include <bits/stdc++.h>
using namespace std;
int main()
{
    int N, M;
    cin >> N >> M;
    vector<vector<int>> Tab;
    vector<pair<int, int>> input;
    for (int i = 0; i < N; i++)
    {
        int l, r;
        cin >> l >> r;
        input.push_back({l, r});
        if (r >= l)
        {
            Tab.push_back({l, r, i});
            Tab.push_back({l + M, r + M, i});
        }
        else
        {
            Tab.push_back({l, r + M, i});
        }
    }
    sort(Tab.begin(), Tab.end());
    int last = -1;
    vector<int> removed(Tab.size());
    for (int i = 0; i < Tab.size(); i++)
    {
        if (last != -1)
        {
            if (Tab[last][1] >= Tab[i][1])
                removed[i] = 1;
        }
        if (removed[i] == 0)
            last = i;
    }
    vector<vector<int>> Tab2;
    for (int i = 0; i < Tab.size(); i++)
        if (!removed[i])
            Tab2.push_back(Tab[i]);
    swap(Tab, Tab2);
    vector<vector<pair<int, int>>> next(log2(N) + 1, vector<pair<int, int>>(N));
    for (int i = Tab.size() - 1; i >= 0; i--)
    {
        int x = lower_bound(Tab.begin(), Tab.end(), vector<int>{Tab[i][1] + 1}) - Tab.begin() - 1;
        if (x != i)
        {
            next[0][Tab[i][2]].first = Tab[x][2];
            next[0][Tab[i][2]].second = Tab[x][1] - Tab[i][1];
        }
    }
    for (int i = 1; i <= log2(N); i++)
    {
        for (int j = 0; j < N; j++)
        {
            next[i][j].first = next[i - 1][next[i - 1][j].first].first;
            next[i][j].second = next[i - 1][j].second + next[i - 1][next[i - 1][j].first].second;
        }
    }
    int best = 1000000000;
    for (int i = 0; i < N; i++)
    {
        int x = i, compte = 1, dist = input[i].second - input[i].first;
        for (int j = log2(N); j >= 0; j--)
        {
            if (dist + next[j][x].second < M)
            {
                dist += next[j][x].second;
                x = next[j][x].first;
                compte += (1 << j);
            }
        }
        if (dist + next[0][x].second >= M)
            best = min(best, compte + 1);
    }
    cout << ((best == 1000000000) ? -1 : best);
}

Compilation message

Main.cpp: In function 'int main()':
Main.cpp:27:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   27 |     for (int i = 0; i < Tab.size(); i++)
      |                     ~~^~~~~~~~~~~~
Main.cpp:38:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   38 |     for (int i = 0; i < Tab.size(); i++)
      |                     ~~^~~~~~~~~~~~

Subtask #1
0 / 14.0

# 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 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 392 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 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Incorrect 1 ms 348 KB Output isn't correct
17 Halted 0 ms 0 KB -

Subtask #2
0 / 17.0

# 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 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 392 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 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Incorrect 1 ms 348 KB Output isn't correct
17 Halted 0 ms 0 KB -

Subtask #3
0 / 9.0

# 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 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 392 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 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Incorrect 1 ms 348 KB Output isn't correct
17 Halted 0 ms 0 KB -

Subtask #4
0 / 13.0

# 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 1 ms 348 KB Output is correct
5 Incorrect 1 ms 344 KB Output isn't correct
6 Halted 0 ms 0 KB -

Subtask #5
0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 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 Incorrect 0 ms 348 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #6
0 / 26.0

# 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 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 392 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 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Incorrect 1 ms 348 KB Output isn't correct
17 Halted 0 ms 0 KB -