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답안 #655453

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
655453 2022-11-04T13:01:38 Z bLIC Mobile (BOI12_mobile) C++17
4 / 100
 1000 ms 81096 KB 
#include <bits/stdc++.h>
using namespace std;

#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define sz(x) (int)(x).size()
#define ft first
#define sd second
#define pb push_back
#define endl '\n'

typedef long long ll;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<pii> vii;
typedef vector<ll> vl;
typedef pair<ll, ll> pll;
typedef vector<pll> vll;
typedef vector<vi> vvi;

#define dbg if(1)

template <class _T>
string printbit(_T x) {string s="";while(x){s=((x%2)?'1':'0')+s;x/=2;} return s;}
template <class _T>
string printbit(_T x, int len) {string s="";while(len--){s=((x%2)?'1':'0')+s;x/=2;} return s;}

const int MOD = 1e9+7;
const int INF = 1e9;
const int maxN = 1e6+5;


ll n;
long double l;
vector<pair<long double, long double>> cor(maxN);


bool check(long double mid){
     vector<pair<long double, long double>> coord;
     for (int i =0;i<n;i++){
          auto p = cor[i];
          auto power = mid;
          if (p.second-power>-1e-4) continue;
          else {
               long double len = sqrt(power*power - p.sd*p.sd);
               coord.pb(make_pair(p.ft-len, p.ft+len));
          }
     }
     sort(all(coord));
     if (coord.empty() || coord[0].ft>1e-5) return false;

     long double curr = 0;
     for (auto x:coord){
          if (x.ft-curr>-1e-4) return false;
          curr = max(curr, x.sd);
          if (curr-l>-1e-4) return true;
     }
     return curr-l>-1e-4;
}

void solve(){
     // cout<<sizeof(l);
     // return;
     cin>>n>>l;
     for (int i = 0;i<n;i++) cin>>cor[i].ft>>cor[i].sd;
     long double l = 0, r = 1e10;
     while(r-l>1e-4){
          long double mid = (l+r)/2;
          if (check(mid)) r = mid;
          else l = mid;
     }
     cout<<fixed<<setprecision(6)<<r;
}


int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);

    int t = 1;
//     cin>>t;

    while(t--){

        solve();
        cout<<endl;
    }
}

Subtask #1
4.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 26 ms 31572 KB Output is correct
2 Correct 27 ms 31592 KB Output is correct
3 Correct 25 ms 31568 KB Output is correct
4 Correct 25 ms 31640 KB Output is correct

Subtask #2
0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 25 ms 31592 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 36 ms 31872 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 48 ms 32112 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 51 ms 32116 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 45 ms 32064 KB Output is correct
2 Correct 53 ms 32044 KB Output is correct
3 Correct 53 ms 32060 KB Output is correct
4 Incorrect 51 ms 32036 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #7
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 289 ms 38208 KB Output is correct
2 Correct 512 ms 38200 KB Output is correct
3 Correct 330 ms 35424 KB Output is correct
4 Incorrect 515 ms 38132 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #8
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 527 ms 38236 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #9
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 457 ms 38640 KB Output is correct
2 Correct 554 ms 38364 KB Output is correct
3 Correct 713 ms 38440 KB Output is correct
4 Incorrect 715 ms 38876 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #10
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 597 ms 38928 KB Output is correct
2 Correct 709 ms 39096 KB Output is correct
3 Correct 856 ms 38932 KB Output is correct
4 Incorrect 652 ms 38860 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #11
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 499 ms 38916 KB Output is correct
2 Correct 713 ms 38928 KB Output is correct
3 Correct 865 ms 38920 KB Output is correct
4 Incorrect 781 ms 38852 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #12
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1097 ms 63872 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #13
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1094 ms 63796 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #14
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1091 ms 80988 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #15
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1093 ms 81000 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #16
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1080 ms 81096 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #17
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1089 ms 80972 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #18
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1086 ms 81020 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #19
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1091 ms 80872 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #20
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1088 ms 80932 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #21
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1092 ms 80872 KB Time limit exceeded
2 Halted 0 ms 0 KB -