oj.uz

Submission #1110947

# Submission time Handle Problem Language Result Execution time Memory
1110947 2024-11-11T05:37:09 Z vjudge1 Mobile (BOI12_mobile) C++17
0 / 100
 879 ms 25760 KB 
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
using namespace std;
using std::mt19937_64;
using std::random_device;
using std::uniform_int_distribution;
#include <numeric>
#define ff              first
#define ss              second
#define int             long long
#define pb              push_back
#define mp              make_pair
#define pii             pair<int,int>
#define vi              vector<int>
#define mii             map<int,int>
#define pqb             priority_queue<int>
#define pqs             priority_queue<int,vi,greater<int> >
#define setbits(x)      __builtin_popcountll(x)
#define zrobits(x)      __builtin_ctzll(x)
#define mod             1000000007
#define inf             1e18
#define ps(x,y)         fixed<<setprecision(y)<<x
#define mk(arr,n,type)  type *arr=new type[n];
#define w(x)            int x; cin>>x; while(x--)
mt19937                 rng(chrono::steady_clock::now().time_since_epoch().count());
 
typedef tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update> pbds;
 
 
void c_p_c()
{
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#ifndef ONLINE_JUDGE
    freopen("milkvisits.in", "r", stdin);
    freopen("milkvisits.out", "w", stdout);
#endif
}
int dx[] = {1, -1, 0, 0};
int dy[] = {0, 0, 1, -1};
int exp(int x, int n, int m) {
    if(x == 0 and n == 0) return 1;
    x %= m; 
    int res = 1;
    while (n > 0) {
        if (n % 2 == 1) { res = res * x % m; }
        x = x * x % m;
        n /= 2;
    }
    return res;
}
bool check(double mid,vector<pair<int,int>> &v,int k,int n){
    double dist = mid*mid;
    for(int i = 0 ; i < n-1; i++){
      double disty = v[i].ss*v[i].ss;
      if(dist-disty >= 0){
        double x = v[i].ff + sqrtl(dist-disty);
        double x2 = v[i].ff - sqrtl(dist-disty);
        if(x <= v[i+1].ff and x <= k){
            double dista = (x-v[i+1].ff)*(x-v[i+1].ff)+(v[i+1].ss*v[i+1].ss);
            if(dista >= dist)  {
                // cout<<x<<" "<<dista<<endl;
                return true;
            }
        }
        if(i > 0){
          if(x2 >= 0 and x2 >= v[i-1].ff){
            double dista = (x2-v[i+1].ff)*(x2-v[i+1].ff)+(v[i+1].ss*v[i+1].ss);
            if(dista >= dist)  {
                // cout<<x2<<" "<<dista<<endl;
                return true;
            }
          }
        }
      }
    }
    if(k >= v[n-1].ff){
      double dista = (k-v[n-1].ff)*(k-v[n-1].ff)+(v[n-1].ss*v[n-1].ss);
            if(dista >= dist)  {
                // cout<<k<<" "<<dista<<endl;
                return true; 
            }
    }
    return false;

}
signed main()
{   
   int t=1;
   // c_p_c();
   // cin >> t;
   while(t--){
     int n,k;
     cin >> n >> k;
     vector<pair<int,int>> v;
     for(int i = 0 ; i < n; i++){
        int x,y;
        cin >> x >> y;
        if(v.empty()){
           v.pb({x,y});
           continue;
        }
            if(x == v.back().ff){
                v.back().ss = min(v.back().ss,abs(y));
            }
            else{
                v.pb({x,y});
            }
     }
     n = v.size();
     // cout<<n<<endl;
     double l = 0, r = k;
     double ans;
     while(l <= r){
        double mid = l + (r-l)/2;
        if(check(mid,v,k,n)){
          ans = mid;
          l = mid+0.0001;
        }
        else{
            r = mid-0.0001;
        }
     }
     cout<<fixed<<setprecision(3);
     cout<<ans<<endl;

   }
    return 0;
}

Compilation message

mobile.cpp: In function 'void c_p_c()':
mobile.cpp:36:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   36 |     freopen("milkvisits.in", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
mobile.cpp:37:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 |     freopen("milkvisits.out", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Output is correct
2 Incorrect 1 ms 336 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 504 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 336 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 3 ms 336 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 3 ms 592 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 4 ms 592 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 37 ms 4176 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #8
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 30 ms 1304 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #9
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 67 ms 4292 KB Output is correct
2 Incorrect 42 ms 2500 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #10
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 56 ms 2752 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #11
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 102 ms 4720 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #12
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 428 ms 13236 KB Output is correct
2 Incorrect 217 ms 8388 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #13
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 230 ms 8776 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #14
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 528 ms 23596 KB Output is correct
2 Incorrect 265 ms 9772 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #15
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 282 ms 10404 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #16
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 639 ms 23596 KB Output is correct
2 Incorrect 299 ms 11336 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #17
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 321 ms 12068 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #18
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 730 ms 23720 KB Output is correct
2 Incorrect 369 ms 12900 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #19
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 338 ms 13736 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #20
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 879 ms 25760 KB Output is correct
2 Incorrect 414 ms 15944 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #21
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 450 ms 17064 KB Output isn't correct
2 Halted 0 ms 0 KB -