Submission #757507

#	Time	Username	Problem	Language	Result	Execution time	Memory
757507		taitruong270	Balloons (CEOI11_bal)	C++17	0 / 100	3 ms	404 KiB

bal

/*==============================================================================================================
         __                    __                                             _____     ______    _______
        |  |                  |  |                                           /  __ \   / _____|  / ______|     
      __|  |__              __|  |__                                         |_|  | |  | |       | |  
     |__|   __|            |__|   __|                                             | |  | |____   | |_____ 
        |  |    _____   _     |  |    ____  __  __  ____    _____    _____       / /   \ ___  \  |  ___  \
        |  |   /  _  \ | |    |  |   /  _/ | | | | /  _  \ /  __ \  /  _  \     / /         | |  | |   | |
        |  |_  | |_| | | |    |  |_  | |   | |_| | | |_| | | |  | | | |_| |    / /___   ____| |  | |___| |
        \____\ \____/| |_|    \____\ |_|   \_____/ \_____/ |_|  |_| \____ |   |______| |______/  \_______/
                                                                        | |
                                                                      __/ |
                                                                     |___/  
                                        Pratice, practice, and practice
I hated every minute of training, but I said, ‘Don’t quit. Suffer now and live the rest of your life as a champion.' - Mohamed Ali 
                              You may not be the best, but must be the most effort
                                          Noi dau + Suy ngam = Tien bo 
==============================================================================================================*/
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ld long double
#define endl '\n'
const ll mod = 1e9+7;
ll n;
ld x[200000], r[200000];

//pair<ll, ll>   (x, r)
ld calc(pair<ld, ld> a, pair<ld, ld> b)
{
    return (a.first-b.first)*(a.first-b.first)/(4*a.second);
}

void solve()
{
    cin>>n;
    for (ll i=1; i<=n; i++) cin>>x[i]>>r[i];
    vector<pair<ll, ll>> st;
    for (ll i=1; i<=n; i++)
    {
        ld max_r=r[i];
        while (!st.empty())
        {
            auto last=st.back();        
            max_r=min(max_r, calc(last, {x[i], r[i]}));
            if (max_r>=last.second) st.pop_back();
            else break;
        }
        cout<<fixed<<setprecision(3)<<max_r<<endl;
        st.push_back({x[i], max_r});
    }
}

int main()
{
    ios_base::sync_with_stdio(false); cin.tie(NULL);
    clock_t start = clock();
    #ifndef ONLINE_JUDGE
    freopen("_input.txt", "r", stdin);
    freopen("_output.txt", "w", stdout);
    #endif
    solve();
    clock_t end = clock();
    cerr<<"Time: "<<fixed<<setprecision(10)<<double(end-start)/double(CLOCKS_PER_SEC)<<"\n";
    return 0;
}

Compilation message (stderr)

bal.cpp: In function 'int main()':
bal.cpp:58:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   58 |     freopen("_input.txt", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
bal.cpp:59:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   59 |     freopen("_output.txt", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

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• Subtask 10: 0 / 10