제출 #374761

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
374761		wzy	Mobile (BOI12_mobile)	C++17	17 / 100	1095 ms	15980 KiB

mobile

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

double f(double mid){
	double cur = 0.00;
	for(int i = 1 ; i <= n; i ++){
		long long dy = v[i].second * v[i].second;
		double len = sqrt(mid*mid - 1.00 * dy);
		if(cur >= (1.00 * v[i].first - len))
			cur = max(cur , 1.00*v[i].first + len);
	}
	return cur >= L;
}

int32_t main(){
	scanf("%d%d" , &n , &L);
	for(int i = 1; i <= n; i ++){
		scanf("%lld%lld" , &v[i].first , &v[i].second);
	}
	sort(v + 1 , v + 1 + n);
	double l = 0.000 , r = 1e12;
	while(r-l > 1e-9){
		double mid = l + (r-l)/2;
		if(f(mid))
			r = mid;
		else
			l = mid;
	}
	printf("%.6lF" , l);
}

컴파일 시 표준 에러 (stderr) 메시지

mobile.cpp: In function 'int32_t main()':
mobile.cpp:19:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   19 |  scanf("%d%d" , &n , &L);
      |  ~~~~~^~~~~~~~~~~~~~~~~~
mobile.cpp:21:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   21 |   scanf("%lld%lld" , &v[i].first , &v[i].second);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 4 / 4
• Subtask 2: 4 / 4
• Subtask 3: 4 / 4
• Subtask 4: 0 / 4
• Subtask 5: 0 / 4
• Subtask 6: 0 / 5
• Subtask 7: 0 / 5
• Subtask 8: 5 / 5
• Subtask 9: 0 / 5
• Subtask 10: 0 / 5
• Subtask 11: 0 / 5
• Subtask 12: 0 / 5
• Subtask 13: 0 / 5
• Subtask 14: 0 / 5
• Subtask 15: 0 / 5
• Subtask 16: 0 / 5
• Subtask 17: 0 / 5
• Subtask 18: 0 / 5
• Subtask 19: 0 / 5
• Subtask 20: 0 / 5
• Subtask 21: 0 / 5