Submission #692487

#	Time	Username	Problem	Language	Result	Execution time	Memory
692487		bojackduy	Mobile (BOI12_mobile)	C++14	0 / 100	1095 ms	8020 KiB

mobile

#include <iostream>
#include <queue>
#include <stack>
#include <algorithm>
#include <string.h>
#include <functional>
#include <iomanip>
#define task "task"
#define size() size() * 1ll 
#define all(x) (x).begin(), (x).end()
#define pb push_back
#define pii pair<int, int>
#define fi first
#define se second
#define MASK(x) (1LL << (x))
#define BIT(x,i) (((x) >> (i)) & 1)
#define numbit(x) __builtin_popcountll(x)

using namespace std;

typedef vector<int> vi;
typedef vector<pii> vii;
typedef long long ll;

template<class t>
bool mini(t &x,t y) {
	if (y < x) {
	   x = y;
	   return 1;
	}
return 0;
}
template<class t>
bool maxi(t &x,t y) {
	if (x < y) {
	   x = y;
	   return 1;
	}
return 0;
}

const int N = 1e6 + 1;
const int M = 1e3 + 1;
const long long mod = 1e9 + 7;
const long long oo = 1e18 + 7;

void solve(int test = -1) {
	int n, m;
	cin >> n >> m;
	pii a[n];
	for (int i = 0; i < n; i++) {
		cin >> a[i].fi >> a[i].se;
	}
	double l = 0, r = m;
	int t = 1000;
	long double ans = 0;
	while (t--) {
		double midl = (2 * l + r) / 3;
		double midr = (l + 2 * r) / 3;
		long double lef = 1e9;
		for (int i = 0; i < n; i++) {
			mini(lef, __builtin_sqrtl((long double)abs(midl - a[i].fi) * abs(midl - a[i].fi) + (long double)1.0 * a[i].se * a[i].se));
		}
		long double rig = 1e9;
		for (int i = 0; i < n; i++) {
			mini(rig, __builtin_sqrtl((long double)abs(midr - a[i].fi) * abs(midr - a[i].fi) + (long double)1.0 * a[i].se * a[i].se));
		}
		if (lef < rig) {
			l = midl;
			maxi(ans, lef);
		} else {
			maxi(ans, rig);
			r = midr;
		}
	}
	long double tmp = 1e9;
	double mid = (l + r) / 2;
	for (int i = 0; i < n; i++) {
		mini(tmp, __builtin_sqrtl((long double)abs(mid - a[i].fi) * abs(mid - a[i].fi) + (long double)1.0 * a[i].se * a[i].se));
	}
	maxi(ans, tmp);
	cout << setprecision(6) << fixed << ans;
}

int32_t main()  {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	// freopen(task".inp", "r", stdin);
	// freopen(task".out", "w", stdout);

	int T = 1;
	// cin >> T;
	for (int i = 1; i <= T; i++) {
		solve(i);
	}
return 0;
}
/*

*/

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