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Submission #935317

# Submission time Handle Problem Language Result Execution time Memory
935317 2024-02-29T03:29:20 Z cryan Mobile (BOI12_mobile) C++17
0 / 100
 387 ms 33980 KB 
// oh, these hills, they burn so bright / oh, these hills, they bring me life
#include "bits/stdc++.h"
using namespace std;

using ll = long long;
#define all(x) begin(x), end(x)
#define rall(x) x.rbegin(), x.rend()
#define sz(x) (int)(x.size())
#define inf 1000000010
#define linf 0x3f3f3f3f3f3f3f3f
#define mp make_pair
#define f first
#define s second
#define pi pair<int, int>
#ifdef LOCAL
#include "/mnt/c/yukon/pp.hpp"
#else
#define endl '\n'
#endif

struct Point {
	double x, y;
};

int main() {
	cin.tie(0)->sync_with_stdio(0);

	int n, l;
	cin >> n >> l;

	function<double(Point, Point)> max_point = [&](Point a, Point b) {
		return (((b.x) * (b.x)) + ((b.y) * (b.y)) - ((a.x) * (a.x)) - ((a.y) * (a.y))) / (2 * (b.x - a.x));
	};

	function<double(Point, Point)> dist = [&](Point a, Point b) {
		return sqrt((a.x - b.x) * (a.x - b.x) + (a.y - b.y) * (a.y - b.y));
	};

	vector<Point> stck(n);
	vector<Point> todo;
	int idx = 0;
	for (int i = 0; i < n; i++) {
		Point cur;
		cin >> cur.x >> cur.y;
		cur.y = abs(cur.y);

		// directly above
		if (idx && stck[idx - 1].x == cur.x && cur.y < stck[idx - 1].y) {
			idx--;
		}

		while (idx > 1 && todo.back().x > max_point(stck[idx - 2], cur)) {
			idx--;
			todo.pop_back();
		}

		stck[idx] = cur;
		if (idx) {
			todo.push_back(Point{max_point(stck[idx - 1], cur), 0});
		}

		idx++;
	}
	// cout << todo << endl;
	// cout << stck << endl;

	Point endpt = {l, 0};
	double ans = max(dist(todo[0], Point({0, 0})), dist(stck[0], todo[0]));
	ans = max({ans, dist(todo.back(), endpt), dist(todo.back(), stck[idx - 1])});
	for (int x = 1; x < sz(todo) - 1; x++) {
		ans = max({ans, dist(todo[x], stck[x]), dist(todo[x], stck[x - 1])});
	}

	cout << fixed << setprecision(6) << ans << endl;
}

// don't get stuck on one approach
// question bounds
// flesh out your approach before implementing o.o
// math it out
// ok well X is always possible, how about X + 1 (etc.)

Compilation message

mobile.cpp: In function 'int main()':
mobile.cpp:67:17: warning: narrowing conversion of 'l' from 'int' to 'double' [-Wnarrowing]
   67 |  Point endpt = {l, 0};
      |                 ^

Subtask #1
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 344 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 344 KB Expected double, but "inf" found
2 Halted 0 ms 0 KB -

Subtask #3
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 348 KB Expected double, but "inf" found
2 Halted 0 ms 0 KB -

Subtask #4
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 344 KB Expected double, but "inf" found
2 Halted 0 ms 0 KB -

Subtask #5
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 344 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 344 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 28 ms 1748 KB Expected double, but "inf" found
2 Halted 0 ms 0 KB -

Subtask #8
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 27 ms 2772 KB Expected double, but "inf" found
2 Halted 0 ms 0 KB -

Subtask #9
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 33 ms 3800 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #10
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 37 ms 2036 KB Expected double, but "inf" found
2 Halted 0 ms 0 KB -

Subtask #11
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 37 ms 3140 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #12
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 161 ms 18116 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #13
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 183 ms 8284 KB Expected double, but "inf" found
2 Halted 0 ms 0 KB -

Subtask #14
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 188 ms 26896 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #15
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 223 ms 9840 KB Expected double, but "inf" found
2 Halted 0 ms 0 KB -

Subtask #16
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 219 ms 29632 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #17
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 274 ms 11352 KB Expected double, but "inf" found
2 Halted 0 ms 0 KB -

Subtask #18
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 249 ms 29624 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #19
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 282 ms 12888 KB Expected double, but "inf" found
2 Halted 0 ms 0 KB -

Subtask #20
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 387 ms 33980 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #21
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 383 ms 15964 KB Expected double, but "inf" found
2 Halted 0 ms 0 KB -