Submission #374748

#	Time	Username	Problem	Language	Result	Execution time	Memory
374748		wzy	Mobile (BOI12_mobile)	C++17	0 / 100	1090 ms	9964 KiB

mobile

#include <bits/stdc++.h>
using namespace std;
const int N = 1000005;
int x[N] , n , L , y[N];


double f(double mid){
	double ans = 0.00;
	for(int i = 1; i <= n; i ++){
		ans = max(ans , hypot(fabs(x[i] - mid) , y[i]));
	}
	return ans;
}

int32_t main(){
	scanf("%d%d" , &n , &L);
	for(int i = 1; i <= n; i ++){
		scanf("%d%d" , &x[i] , &y[i]);
	}
	double l = 0.00 , r = L;
	while(r - l > 1e-9){
		double ml = l + (r-l)/3 , mr = r - (r-l)/3;
		if(f(ml) > f(mr))
			l = ml;
		else
			r = mr;
	}
	printf("%.9lf" , f(l));
}

Compilation message (stderr)

mobile.cpp: In function 'int32_t main()':
mobile.cpp:16:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   16 |  scanf("%d%d" , &n , &L);
      |  ~~~~~^~~~~~~~~~~~~~~~~~
mobile.cpp:18:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   18 |   scanf("%d%d" , &x[i] , &y[i]);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

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