Submission #520825

#	Time	Username	Problem	Language	Result	Execution time	Memory
520825		jpark	Mobile (BOI12_mobile)	C++14	4 / 100	1085 ms	41204 KiB

mobile

#include<iostream>
#include<algorithm>
#include<vector>
#include<math.h>
#define pii pair<int,int>
#define f first
#define s second
using namespace std;

int main(){
    int n,le; cin >> n >> le;
    vector<pii> t;
    int a,b;
    for(int x=0; x<n; ++x){
        cin >> a >> b;
        t.push_back({a,b});
    }
    double l = 0;
    double r = 1e10;
    double mid;
    while(r-l>1e-5){
        vector<pair<double,double>> range;
        mid = l+(r-l)/2;
        for(int x=0; x<n; ++x){
            if(mid<t[x].s){
                continue;
            }
            double mi = t[x].f-sqrt(mid*mid-t[x].s*t[x].s);
            double ma = t[x].f+sqrt(mid*mid-t[x].s*t[x].s);
            range.push_back({mi,ma});
        }
        sort(range.begin(),range.end());
        double maxc = 0;
        bool p = true;
        for(int x=0; x<range.size(); ++x){
            if(range[x].s<0){
                continue;
            }
            if(range[x].f>maxc){
                p = false;
                break;
            }
            maxc = max(maxc,range[x].s);
        }
        if(p&&maxc>=le){
            r = mid;
        }
        else{
            l = mid;
        }
    }
    cout << l;
}

Compilation message (stderr)

mobile.cpp: In function 'int main()':
mobile.cpp:35:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<double, double> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   35 |         for(int x=0; x<range.size(); ++x){
      |                      ~^~~~~~~~~~~~~

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