Submission #919291

#	Time	Username	Problem	Language	Result	Execution time	Memory
919291		hqminhuwu	Mobile (BOI12_mobile)	C++14	50 / 100	1045 ms	16272 KiB

mobile

#include <bits/stdc++.h>
#define forr(_a,_b,_c) for(_a = (_b); _a <= (_c); ++_a)
#define ford(_a,_b,_c) for(_a = (_b) + 1; _a --> (_c);)
#define forf(_a,_b,_c) for(_a = (_b); _a < (_c); ++_a)
#define st first
#define nd second
#define ll long long
#define ull unsigned long long
#define pii pair <int,int>
#define pll pair <ll,ll>
#define piii pair <int,pii>
#define vi vector <int>
#define pb push_back
#define mp make_pair
#define all(x) begin(x),end(x)
#define file "test"


using namespace std;
const int N = 5e5 + 5;
const ll oo = 1e9;
const ll mod = 1e9 + 7;

int n, ff, i;
pll a[N];

int main(){
	ios_base::sync_with_stdio(0); cin.tie(0);
	#ifdef hqm
	   freopen(file".inp", "r", stdin); freopen(file".out", "w", stdout);
	#endif

	cin >> n >> ff;

	forr (i, 1, n)
		cin >> a[i].st >> a[i].nd;
	
	double l = 1, r = 2 * oo;
	int cnt = 400;
	while (cnt--){
		double mid = (r + l) / 2, qq = 0;
		forr (i, 1, n){
			double dis = sqrt(mid * mid - a[i].nd * a[i].nd);
			if (a[i].st - dis <= qq)
				qq = max (qq, a[i].st + dis);
		}
		if (qq >= ff)
			r = mid;
		else l = mid;
	}

	cout << fixed << setprecision(4) << l;
	return 0;
}
/*



*/

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