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Submission #884570

# Submission time Handle Problem Language Result Execution time Memory
884570 2023-12-07T17:00:20 Z bedupako Mobile (BOI12_mobile) C++17
0 / 100
 1000 ms 48840 KB 
#include <bits/stdc++.h>
using namespace std;

#define all(x) x.begin(),x.end()
typedef long long ll;
const double E = 1e-9;

bool good(vector<pair<double,double>>& x, double l){
	int n = x.size();
	sort(all(x));
	stack<pair<double,double>> s;
	for(int i = 0; i < n; i++){
		if(s.empty()){
			s.push(x[i]);
		}else if(s.top().second >= x[i].first){
			s.top().second = max(s.top().second,x[i].second);
		}else{
			s.push(x[i]);
		}
	}
	if((int)s.size() == 1){
		if(abs(s.top().first) <= E and abs(s.top().second-l) <= E){
			return true;
		}
	}
	return false;
}

int main(){
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	int n,l;
	cin >> n >> l;
	vector<double> x(n),y(n);
	for(int i = 0; i < n; i++){
		cin >> x[i] >> y[i];
	}
	double low = 0, high = 10;
	double ans = 0l;
	int cnt = 0;
	while(high - low >= E and cnt <= 100){
		cnt++;
		double R = (low + high)/2;
		vector<pair<double,double>> ranges;
		for(int i = 0; i < n; i++){
			if(R < y[i]){
				continue;
			}else{
				double val = sqrt(R*R - y[i]*y[i]);
				ranges.emplace_back(max(0/1.0,(double)x[i]-val),
														min((double)l,(double)x[i]+val));
			}
		}
		if(good(ranges,l)){
			ans = R;
			high = R - E;
		}else{
			low = R + E;
		}
	}
	cout << fixed << setprecision(3) <<  ans << '\n';
}

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 Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 560 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 4 ms 532 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 4 ms 636 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 348 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 24 ms 1628 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #8
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 91 ms 3376 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #9
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 114 ms 5712 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #10
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 36 ms 1880 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #11
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 36 ms 1884 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #12
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 634 ms 24568 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #13
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 187 ms 8284 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #14
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 806 ms 36508 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #15
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 229 ms 9836 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #16
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 918 ms 40812 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #17
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 256 ms 11352 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #18
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 969 ms 46084 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #19
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 295 ms 12988 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #20
0 / 5.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1026 ms 48840 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #21
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 363 ms 15964 KB Output isn't correct
2 Halted 0 ms 0 KB -