Submission #668633

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
668633	2022-12-04T10:06:26 Z	600Mihnea	Lightning Rod (NOI18_lightningrod)	C++17	100 / 100	583 ms	76056 KB

lightningrod

#include <bits/stdc++.h>


using namespace std;

inline void read(int& x) {
    x = 0;
    char ch = getchar();
    while (ch&16){
		x = (x << 3) + (x << 1) + (ch&15);
		ch = getchar();
	}
}


struct T
{
  int x;
  int y;
};

bool eat(T a, T b)
{
  return a.x <= b.x && a.y <= b.y;
}

signed main()
{
  int n;
  read(n);
  vector<T> stk;
  stk.reserve(n);
  for (int i = 1; i <= n; i++)
  {
    int x, y;
    read(x);
    read(y);
    T cur = {-x - y, x - y};
    if (stk.empty())
    {
      stk.push_back(cur);
    }
    else
    {
      if (eat(stk.back(), cur))
      {
        continue;
      }
      while (!stk.empty() && eat(cur, stk.back()))
      {
        stk.pop_back();
      }
      stk.push_back(cur);
    }
  }
  cout << (int) stk.size() << "\n";
  return 0;
}

Subtask #1

4.0 / 4.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	402 ms	76056 KB	Output is correct
2	Correct	407 ms	75936 KB	Output is correct
3	Correct	397 ms	73840 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	0 ms	212 KB	Output is correct
5	Correct	0 ms	212 KB	Output is correct
6	Correct	0 ms	212 KB	Output is correct
7	Correct	0 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	1 ms	212 KB	Output is correct
4	Correct	0 ms	212 KB	Output is correct
5	Correct	0 ms	212 KB	Output is correct
6	Correct	0 ms	212 KB	Output is correct
7	Correct	0 ms	212 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	0 ms	212 KB	Output is correct
5	Correct	0 ms	212 KB	Output is correct
6	Correct	0 ms	212 KB	Output is correct
7	Correct	0 ms	212 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	212 KB	Output is correct
12	Correct	1 ms	212 KB	Output is correct
13	Correct	0 ms	212 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	0 ms	212 KB	Output is correct
5	Correct	0 ms	212 KB	Output is correct
6	Correct	0 ms	212 KB	Output is correct
7	Correct	0 ms	212 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	212 KB	Output is correct
12	Correct	1 ms	212 KB	Output is correct
13	Correct	0 ms	212 KB	Output is correct
14	Correct	12 ms	212 KB	Output is correct
15	Correct	12 ms	316 KB	Output is correct
16	Correct	12 ms	848 KB	Output is correct

Subtask #6

10.0 / 10.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	401 ms	48956 KB	Output is correct
2	Correct	390 ms	49084 KB	Output is correct
3	Correct	393 ms	47708 KB	Output is correct

Subtask #7

20.0 / 20.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	402 ms	76056 KB	Output is correct
2	Correct	407 ms	75936 KB	Output is correct
3	Correct	397 ms	73840 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	0 ms	212 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	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	212 KB	Output is correct
15	Correct	1 ms	212 KB	Output is correct
16	Correct	0 ms	212 KB	Output is correct
17	Correct	12 ms	212 KB	Output is correct
18	Correct	12 ms	316 KB	Output is correct
19	Correct	12 ms	848 KB	Output is correct
20	Correct	401 ms	48956 KB	Output is correct
21	Correct	390 ms	49084 KB	Output is correct
22	Correct	393 ms	47708 KB	Output is correct
23	Correct	583 ms	344 KB	Output is correct
24	Correct	516 ms	560 KB	Output is correct
25	Correct	507 ms	2944 KB	Output is correct