Submission #842335

#	Time	Username	Problem	Language	Result	Execution time	Memory
842335		a5a7	Mobile (BOI12_mobile)	C++14	8 / 100	265 ms	16088 KiB

mobile

#include <bits/stdc++.h>
#define ALL(x) (x).begin(), (x).end()
#define REP(i, a, b) for (int i = (a); i < (b); i++)
#define READ(arr, n) for (int i = 0; i < (n); i++) cin >> arr[i];
#define ABS(a) (max((a), -(a)))
#define MOD 1000000007
using namespace std;
typedef long double ld;
typedef long long ll;

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n; ll len;
    cin >> n >> len;
    ll x[n], y[n];
    for (int i = 0; i < n; i++) cin >> x[i] >> y[i];
    double left = 1, right = 1.5e9;
    while ((right-left)>1e-3){
        double mid = (left+right)/2, curr = 0;
        for (int i = 0; i < n; i++){
            if (y[i]>mid) continue;
            double sq = sqrt(mid*mid-y[i]*y[i]);
            double l = x[i]-sq, r = x[i]+sq;
            if (curr > l) curr = max(curr, r);
        }
        if (curr >= len){
            right = mid;
        }else{
            left = mid;
        }
    }
    cout << left << endl;
}

• Subtask 1: 4 / 4
• Subtask 2: 4 / 4
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• Subtask 21: 0 / 5