제출 #970788

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
970788		hihihihaw	Mobile (BOI12_mobile)	C++17	100 / 100	735 ms	32192 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;
pair<ld,ld> v[1000023];
void solve(){
    cin>>n>>k;
    for (int i=0;i<n;i++){
        ld x,y;
        cin>>x>>y;
        v[i]={x,y};
    }
    ld l=0,r=1500000000;
    while (r-l>0.001){
        ld m=(l+r)/2;
        ld b=0;
        ld x=m;
        for (int i=0;i<n;i++){
            if (x*x-v[i].se*v[i].se>0){
                ld y=sqrt(x*x-v[i].se*v[i].se);
                if (v[i].fi+y<0 || v[i].fi-y>k) continue;
                ld a1=max(v[i].fi-y,(ld)0),b1=min(v[i].fi+y,(ld)k);
                if (a1<=b) b=max(b,b1);
            }
        }
        if (b==k) r=m;
        else l=m;
    }
    cout<<setprecision(15)<<l<<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;
}

컴파일 시 표준 에러 (stderr) 메시지

mobile.cpp: In function 'int32_t main()':
mobile.cpp:91:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   91 |         freopen("socdist.in", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
mobile.cpp:92:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   92 |         freopen("socdist.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

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