Submission #1016976

#	Time	Username	Problem	Language	Result	Execution time	Memory
1016976		Keshav211	Mobile (BOI12_mobile)	C++14	0 / 100	1076 ms	108344 KiB

mobile

#include <algorithm>
#include <fstream>
#include <iostream>
#include <vector>
#include <map>
#include <stack>
#include <queue>
#include <deque>
#include <set>
#include <chrono>
#include <string>
#include <numeric>
#include <cmath>
#include <iomanip>
#include <climits>
#include <bitset>
#define all(x) (x).begin(), (x).end()
#define vec(n) vll arr(n);
#define printarr(arr) for(auto i:arr){cout<<i<<" ";}cout<<endl;
#define printdict(dict) for(auto i:dict)cout<<i.first<<": "<<i.second<<endl;
#define printadj(adj) for(ll i=0;i<n;i++){if(!adj[i].empty()){cout<<i<<": ";printarr(adj[i])}}
#define read(arr); for(ll i=0;i<arr.size();i++) cin>>arr[i];
#define readundirected(m) for(ll i=0;i<m;i++){ll a,b; cin>>a>>b; a--;b--; adj[a].pb(b);adj[b].pb(a);}
#define readdirected(m) for(ll i=0;i<m;i++){ll a,b; cin>>a>>b; a--;b--; adj[a].pb(b);}
#define readundirectedweighted(m) for(ll i=0;i<m;i++){ll a,b,w; cin>>a>>b>>w; a--;b--; adj1[a].pb({b,w});adj1[b].pb({a,w});}
#define readdirectedweighted(m) for(ll i=0;i<m;i++){ll a,b,w; cin>>a>>b>>w; a--;b--; adj1[a].pb({b,w});}
#define readfunc(n) for(ll i=0;i<n;i++){ll a;cin>>a;a--;func_adj[i]=a;}
#define grid(n,m) for (ll i=1;i<=n;i++){for (ll j=1;j<=m;j++) cin>>graph[i][j];}
#define vll vector<ll>
#define sll set<ll>
#define msll multiset<ll>
#define qll queue<ll>
#define pll pair<ll,ll>
#define str string
#define pb push_back
#define ll long long
#define ld long double
using namespace std;
const str alph="abcdefghijklmnopqrstuvwxyz";
const str capalph="ABCDEFGHIJKLMNOPQRSTUVWXYZ";
const ll inf=5e5+1;
const ll graph_size=1e3+2;
const ll mod=1e9+7;
const ld pi=3.141592653589793238462643383279502884197;
const ll large=1e18;
const ll small=-1e18;
vll adj[inf];
vector<pll> adj1[inf];
bool visited[inf];
ll parent[inf];
ll distance[graph_size][graph_size];
char graph[graph_size][graph_size];
vector<pll> directions={{0,-1},{-1,0},{1,0},{0,1}};
bool floodfill_visited[graph_size][graph_size];
ll floodfill_level[graph_size][graph_size];
pll floodfill_parent[graph_size][graph_size];
// Fast Input/Output
void fastio(){
    ios_base::sync_with_stdio(0);
    cin.tie(nullptr);
}
// File Input/Output
str fileio(const string&filePath=__FILE__){
    size_t lastSlash=filePath.find_last_of('/');
    size_t lastDot=filePath.rfind('.');
    return filePath.substr(lastSlash+1,lastDot-lastSlash-1);
}
// For Yes Or No Problems
str yes_or_no(bool test){
    if (test){
       return "YES";
    }
    return "NO";
}
ll n,l;
pair<ld,ld> combine(pair<ld,ld> p,pair<ld,ld> q){
    if (q.first<=p.second){
        p.second=q.second;
    }
    return p;
}
// Binary Search
vector<pair<ld,ld>> arr;
bool check(ld radius){
    vector<pair<ld,ld>> segments;
    for (auto i:arr){
        if (radius<i.second){
            continue;
        }
        ld len=sqrt(radius*radius-i.second*i.second);
        segments.pb({i.first-len,i.first+len});
    }
    pair<ld,ld> curr={0,0};
    for (auto i:segments){
        curr=combine(curr,i);
    }
    if (curr.second<l){
        return 0;
    }
    return 1;
}
// Returns the first value in the range such that check(value)=True.
ld first_true(ld low,ld high){
    while (low+(ld)(1)/(ld)(inf)<high){
        ld mid=(low+high)/2;
        if (mid<10){
            ll z=1;
        }
        if (check(mid)){
            high=mid;
        }
        else{
            low=mid+(ld)(1)/(ld)(inf);
        }
    }
    return low;
}
int main(){
    // auto start_time=chrono::steady_clock::now();
    fastio();
    // str filename=fileio();
    // ifstream cin(filename+".in");
    // ofstream cout(filename+".out");
    ll t=1;
    // cin>>t;
    while (t--){
        cin>>n>>l;
        arr.resize(n);
        for (ll i=0;i<n;i++){
            cin>>arr[i].first>>arr[i].second;
        }
        cout<<setprecision(20)<<first_true(0,1e18)<<"\n";
    }
    // auto end_time=chrono::steady_clock::now();
    // auto elapsed_time=chrono::duration_cast<chrono::milliseconds>(end_time-start_time);
    // cout<<"Elapsed time: "<<elapsed_time.count()<<" milliseconds\n";
}

Compilation message (stderr)

mobile.cpp: In function 'long double first_true(long double, long double)':
mobile.cpp:107:16: warning: unused variable 'z' [-Wunused-variable]
  107 |             ll z=1;
      |                ^

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