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Submission #548732

# Submission time Handle Problem Language Result Execution time Memory
548732 2022-04-14T10:57:09 Z jack715 Lightning Rod (NOI18_lightningrod) C++14
100 / 100
 1864 ms 262144 KB 
#include <bits/stdc++.h>
#define ll long long
#define pb push_back
#define pp pop_back
#define mp make_pair
#define bb back
#define ff first
#define ss second

using namespace std;

bool protect(pair<int, int>& a, pair<int, int>& b) {
    return (abs(a.ff-b.ff) <= a.ss-b.ss);
}

int main(){
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    int n, a, b, ans = 1;
    cin >> n;
    stack<pair<int, int> > select;
    vector<pair<int, int> > nums(n), prot(n);
    for (int i = 0; i < n; i++) {
        cin >> nums[i].ff >> nums[i].ss;
        prot[i] = nums[i];
    }
    
    select.push(nums[0]);
    for (int i = 1; i < n; i++) {
        if (!select.empty() && protect(select.top(), nums[i]))
            continue;
        while (!select.empty() && protect(nums[i], select.top())) 
            select.pop();
        
        select.push(nums[i]);
    }

    cout << select.size() << '\n';
    return 0;
}

Compilation message

lightningrod.cpp: In function 'int main()':
lightningrod.cpp:18:12: warning: unused variable 'a' [-Wunused-variable]
   18 |     int n, a, b, ans = 1;
      |            ^
lightningrod.cpp:18:15: warning: unused variable 'b' [-Wunused-variable]
   18 |     int n, a, b, ans = 1;
      |               ^
lightningrod.cpp:18:18: warning: unused variable 'ans' [-Wunused-variable]
   18 |     int n, a, b, ans = 1;
      |                  ^~~

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 1824 ms 262144 KB Output is correct
2 Correct 1787 ms 262144 KB Output is correct
3 Correct 1689 ms 259300 KB Output is correct

Subtask #2
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 320 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 212 KB Output is correct
6 Correct 1 ms 212 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 320 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 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 212 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 1 ms 232 KB Output is correct

Subtask #4
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 320 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 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 212 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 1 ms 232 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 328 KB Output is correct

Subtask #5
26.0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 320 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 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 212 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 1 ms 232 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 328 KB Output is correct
14 Correct 53 ms 4672 KB Output is correct
15 Correct 44 ms 4840 KB Output is correct
16 Correct 40 ms 5356 KB Output is correct

Subtask #6
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1553 ms 207604 KB Output is correct
2 Correct 1591 ms 230692 KB Output is correct
3 Correct 1493 ms 218960 KB Output is correct

Subtask #7
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1824 ms 262144 KB Output is correct
2 Correct 1787 ms 262144 KB Output is correct
3 Correct 1689 ms 259300 KB Output is correct
4 Correct 1 ms 320 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 212 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 1 ms 232 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 328 KB Output is correct
17 Correct 53 ms 4672 KB Output is correct
18 Correct 44 ms 4840 KB Output is correct
19 Correct 40 ms 5356 KB Output is correct
20 Correct 1553 ms 207604 KB Output is correct
21 Correct 1591 ms 230692 KB Output is correct
22 Correct 1493 ms 218960 KB Output is correct
23 Correct 1864 ms 172052 KB Output is correct
24 Correct 1714 ms 152192 KB Output is correct
25 Correct 1842 ms 262144 KB Output is correct