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Submission #538833

# Submission time Handle Problem Language Result Execution time Memory
538833 2022-03-17T21:23:34 Z four_specks Lightning Rod (NOI18_lightningrod) C++17
100 / 100
 1834 ms 262144 KB 
#include <bits/stdc++.h>

using namespace std;

inline namespace
{
} // namespace

struct Point
{
    long x, y;

    bool covers(const Point &p) const { return abs(x - p.x) <= y - p.y; }
};

void solve()
{
    int n;
    cin >> n;

    stack<Point> st;
    for (int i = 0; i < n; i++)
    {
        Point pt;
        cin >> pt.x >> pt.y;

        while (!st.empty() && pt.covers(st.top()))
            st.pop();
        if (st.empty() || !st.top().covers(pt))
            st.push(pt);
    }

    cout << (int)st.size() << '\n';
}

int main()
{
    ios_base::sync_with_stdio(false), cin.tie(NULL);

    solve();

    return 0;
}

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 1514 ms 262144 KB Output is correct
2 Correct 1513 ms 262144 KB Output is correct
3 Correct 1452 ms 262144 KB Output is correct

Subtask #2
7.0 / 7.0

# 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 1 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 316 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 ms 316 KB Output is correct

Subtask #3
12.0 / 12.0

# 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 1 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 316 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 ms 316 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 0 ms 212 KB Output is correct

Subtask #4
21.0 / 21.0

# 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 1 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 316 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 ms 316 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 340 KB Output is correct

Subtask #5
26.0 / 26.0

# 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 1 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 316 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 ms 316 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 40 ms 3876 KB Output is correct
15 Correct 48 ms 3624 KB Output is correct
16 Correct 36 ms 4320 KB Output is correct

Subtask #6
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1539 ms 198616 KB Output is correct
2 Correct 1482 ms 198716 KB Output is correct
3 Correct 1409 ms 193736 KB Output is correct

Subtask #7
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1514 ms 262144 KB Output is correct
2 Correct 1513 ms 262144 KB Output is correct
3 Correct 1452 ms 262144 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 1 ms 316 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 1 ms 316 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 0 ms 212 KB Output is correct
13 Correct 0 ms 212 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 40 ms 3876 KB Output is correct
18 Correct 48 ms 3624 KB Output is correct
19 Correct 36 ms 4320 KB Output is correct
20 Correct 1539 ms 198616 KB Output is correct
21 Correct 1482 ms 198716 KB Output is correct
22 Correct 1409 ms 193736 KB Output is correct
23 Correct 1800 ms 175648 KB Output is correct
24 Correct 1834 ms 157080 KB Output is correct
25 Correct 1700 ms 143056 KB Output is correct