Submission #970585

#	Time	Username	Problem	Language	Result	Execution time	Memory
970585		hihihihaw	Mobile (BOI12_mobile)	C++17	0 / 100	1068 ms	33460 KiB

mobile

#pragma GCC optimize("O3,unroll-loops")    
#include <bits/stdc++.h>
using namespace std;
 
#define int long long
#define pb push_back
#define pii pair<int,int>
#define sz(v) (int)v.size()
#define fi first
#define se second
#define INF 1223372036854775807
#define MOD 1000000007
#define cint(x) int x;cin>>x;
#define cinarr(a,n) int a[n];for (int i=0;i<n;i++) cin>>a[i];
#define coutarr(a) for (auto d:a)cout<<d<<" "; cout<<endl;
#define coutarrD(a) for (auto d:a) cout<<d.fi<<","<<d.se<<" "; cout<<endl;
#define AYBERK_SARICA ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
#define endl '\n'
#define ld long double
#define mid (start+end)/2

int t=1;
int interactive=0;
int usaco=0;
int testCase=0;
int n,k;
vector<pii> v;
ld f(ld x){
    ld mn=99999999999999;
    for (int i=0;i<n;i++){
        mn=min(mn,sqrt(v[i].se*v[i].se+abs(v[i].fi-x)*abs(v[i].fi-x)));
    }
    return mn;
}

void solve(){
    cin>>n>>k;
    for (int i=0;i<n;i++){
        ld x,y;
        cin>>x>>y;
        v.pb({x,y});
    }
    int y=200;
    ld l=0,r=k;
    while (y--){
        ld m=(l+r)/2;
        if (f(m)>f(m+0.00000001)) r=m;
        else l=m;
    }
    cout<<setprecision(10)<<f(r)<<endl;

    
    
    

    
    


    
    
    
    
    

    

    
    

    

    
}



 
 
    
 
 
 
 
 
int32_t main(){
    AYBERK_SARICA;
    if (usaco){
        freopen("socdist.in", "r", stdin);
        freopen("socdist.out", "w", stdout);
    }
    if (!interactive){
    #ifdef Local
        freopen("in.txt", "r", stdin);
        freopen("out.txt", "w", stdout);
        //freopen("wormsort.out", "w", stdout);
    #endif
    }
    if (t==1) solve();
    else{
        cin>>t;
        while (t--){testCase++;solve();}
    }
    
        
    return 0;
}

Compilation message (stderr)

mobile.cpp: In function 'int32_t main()':
mobile.cpp:89:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   89 |         freopen("socdist.in", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
mobile.cpp:90:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   90 |         freopen("socdist.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

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