제출 #1035041

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1035041		Uniq0rn	Mobile (BOI12_mobile)	C++14	0 / 100	409 ms	32604 KiB

mobile

#include <bits/stdc++.h>
using namespace std;
 
#define ld long double 
#define ll long long int
#define pi pair<int,int>
#define sz(x) (int)x.size()
#define all(x) begin(x),end(x)

int main()
{
    cin.tie(0)->sync_with_stdio(0);
    int n;
    double L;
    cin >> n >> L;
    vector<pair<double,double>> a(n);
    for(auto &[x,y]:a) cin >> x >> y;
    sort(all(a));
    auto len = [&](double a,double b){
        return sqrt(a*a - b*b);
    };
    double l = 0,r = 1e9;
    while(r - l > 0.0001){
        double mid = (l + r) / 2.0;
        double mn = a[0].first - len(mid,a[0].second),mx = a[0].first + len(mid,a[0].second);
        bool ch = (mid >= a[0].second);
        for(int i=1;i<n && ch;i++){
            if(mid < a[0].second){
                ch = false;
                break;
            }
            double le = a[i].first - len(mid,a[i].second),ri = a[i].first + len(mid,a[i].second);
            if(le <= mx){
                mx = ri;
            }
            else{
                ch = false;
                break;
            }
        }
        if(ch && mn <= 0 && mx >= L){
            r = mid;
        }
        else{
            l = mid;
        }
    }
    cout << setprecision(6) << fixed << r;
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

mobile.cpp: In function 'int main()':
mobile.cpp:17:15: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   17 |     for(auto &[x,y]:a) cin >> x >> y;
      |               ^

• Subtask 1: 0 / 4
• Subtask 2: 0 / 4
• Subtask 3: 0 / 4
• Subtask 4: 0 / 4
• Subtask 5: 0 / 4
• Subtask 6: 0 / 5
• Subtask 7: 0 / 5
• Subtask 8: 0 / 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