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Submission #541688

# Submission time Handle Problem Language Result Execution time Memory
541688 2022-03-24T07:44:28 Z cristi_a Lightning Rod (NOI18_lightningrod) C++17
80 / 100
 2000 ms 262144 KB 
#include <bits/stdc++.h>
using namespace std;

bool cover(pair<int,int> a, pair<int,int> b) {
    return abs(a.first-b.first) <= a.second - b.second;
}

int main() {
    ios::sync_with_stdio(0);
    cin.tie(0);

    int n; cin >> n;
    vector<pair<int,int>> v(n);
    for(int i=0; i<n; i++) cin >> v[i].first >> v[i].second;
    sort(v.begin(), v.end());
    stack<pair<int,int>> st;
    for(int i=0; i<n; i++) {
        while(!st.empty() and cover(v[i], st.top())) st.pop();
        if(st.empty()) st.emplace(v[i]);
        else if(!cover(st.top(), v[i])) st.emplace(v[i]);
    }
    cout << st.size();
    return 0;
}

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 1766 ms 262144 KB Output is correct
2 Correct 1823 ms 262144 KB Output is correct
3 Correct 1724 ms 260388 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 0 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 320 KB Output is correct
6 Correct 1 ms 324 KB Output is correct
7 Correct 1 ms 212 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 0 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 320 KB Output is correct
6 Correct 1 ms 324 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 0 ms 320 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 0 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 320 KB Output is correct
6 Correct 1 ms 324 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 0 ms 320 KB Output is correct
11 Correct 1 ms 380 KB Output is correct
12 Correct 1 ms 376 KB Output is correct
13 Correct 1 ms 336 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 0 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 320 KB Output is correct
6 Correct 1 ms 324 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 0 ms 320 KB Output is correct
11 Correct 1 ms 380 KB Output is correct
12 Correct 1 ms 376 KB Output is correct
13 Correct 1 ms 336 KB Output is correct
14 Correct 45 ms 5340 KB Output is correct
15 Correct 45 ms 5196 KB Output is correct
16 Correct 49 ms 5180 KB Output is correct

Subtask #6
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1782 ms 225680 KB Output is correct
2 Correct 1752 ms 225404 KB Output is correct
3 Correct 1652 ms 219928 KB Output is correct

Subtask #7
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1766 ms 262144 KB Output is correct
2 Correct 1823 ms 262144 KB Output is correct
3 Correct 1724 ms 260388 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 1 ms 320 KB Output is correct
9 Correct 1 ms 324 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 0 ms 212 KB Output is correct
13 Correct 0 ms 320 KB Output is correct
14 Correct 1 ms 380 KB Output is correct
15 Correct 1 ms 376 KB Output is correct
16 Correct 1 ms 336 KB Output is correct
17 Correct 45 ms 5340 KB Output is correct
18 Correct 45 ms 5196 KB Output is correct
19 Correct 49 ms 5180 KB Output is correct
20 Correct 1782 ms 225680 KB Output is correct
21 Correct 1752 ms 225404 KB Output is correct
22 Correct 1652 ms 219928 KB Output is correct
23 Execution timed out 2023 ms 245972 KB Time limit exceeded
24 Halted 0 ms 0 KB -