Submission #1095197

#	Time	Username	Problem	Language	Result	Execution time	Memory
1095197		Kodik	Mobile (BOI12_mobile)	C++17	40 / 100	1067 ms	31856 KiB

mobile

#include <bits/stdc++.h>
using namespace std;
#define ss second
#define ff first
typedef long long ll;
typedef long double ld;
#define int ll






signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    ld n, l; 
    cin >> n >> l;
    pair<ld,ld> bases[1000000];
    for(int i = 0; i < n; ++i){
        cin >> bases[i].ff >> bases[i].ss;
    }
    ld left = 0, right = 2e9;
    while(right-left>1e-3){
        ld mid = left + (right-left)/2;
        ld curr = 0;
        for(int i = 0; i < n; ++i){
            ld x = bases[i].ff;
            ld y = bases[i].ss;
            ld hi_range = sqrt(mid*mid-y*y);
            ld start = x-hi_range, end = x+hi_range;
            if(start<=curr) curr = max(curr, end);
        }
        if(curr>=l){
            right = mid;
        }else{
            left = mid;
        }
    }
    cout << fixed << setprecision(3) << right;
    return 0;   
}

• Subtask 1: 4 / 4
• Subtask 2: 4 / 4
• Subtask 3: 4 / 4
• Subtask 4: 4 / 4
• Subtask 5: 4 / 4
• Subtask 6: 5 / 5
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• Subtask 15: 5 / 5
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• Subtask 21: 0 / 5