Submission #1098716

#	Time	Username	Problem	Language	Result	Execution time	Memory
1098716		sano	Mobile (BOI12_mobile)	C++14	12 / 100	994 ms	9908 KiB

mobile

#include<iostream>
#include<vector>
#include<queue>
#include<deque>
#include<string>
#include<fstream>
#include<algorithm>
#include <iomanip>
#include<map>
#include <set>
#include <unordered_map>
#include <stack>
#include <unordered_set>
#include <cmath>
#define ll long long
#define For(i, n) for(int i = 0; i < (int)n; i++)
#define ffor(i, a, n) for(int i = (int)a; i < (int)n; i++)
#define rfor(i, n) for(int i = (int)n; i >= (int)0; i--)
#define rffor(i, a, n) for(int i = (int)n; i >= (int)a; i--)
#define vec vector
#define ff first
#define ss second
#define pb push_back
#define shit short int
#define pii pair<int, int>
#define NEK 2147483640
#define mod 1000000007
#define mod2 1000000009
#define rsz resize 
#define prv1 43
#define prv2 47
#define D 8

using namespace std;

int main() {
	double n, asd;
	cin >> n >> asd;
	vec<pii> p;
	For(i, n) {
		double x, y;
		cin >> x >> y;
		if (p.size() > 0) {
			if (x == p.back().ff && y > 0 && p.back().ss > 0) continue;
			if (x == p.back().ff && y < 0) p.pop_back();
		}
		p.push_back({ x, y });
	}
	double l = 0;
	double r = 1414213570;
	while ((r - l) > (0.0000001)) {
		double mid = (l + r) / 2;
		double k = 0;
		For(i, p.size()) {
			double d = sqrt(mid * mid - p[i].ss * p[i].ss);
			double s = p[i].ff - d;
			double e = p[i].ff + d;
			if (s > k) continue;
			k = max(k, e);
		}
		if (k >= asd) r = mid;
		else l = mid;
	}
	cout << fixed << setprecision(3);
	cout << l << '\n';
	return 0;
}

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