Submission #1123380

#	Time	Username	Problem	Language	Result	Execution time	Memory
1123380		hihihihaw	Balloons (CEOI11_bal)	C++20	100 / 100	167 ms	1944 KiB

bal

#pragma GCC optimize("O3,unroll-loops,fast-math")
#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 999999992000000023
#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 BERKAY_TUP  ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
#define endl '\n'
#define ld long double
#define mid (start + end) / 2
#define vvi vector<vector<int>>

int t=1;
int interactive=0;
int usaco=0;
int testCase=0;

void solve(){
    int n;
    cin>>n;
    stack<pair<ld,ld>> ss;
    for (int i=0;i<n;i++){
        ld x,r;
        cin>>x>>r;
        ld mn=r;
        while (sz(ss)){
            auto d=ss.top();
            mn=min(mn,min(((d.fi-x)*(d.fi-x))/(4*d.se),r));
            if (min(((d.fi-x)*(d.fi-x))/(4*d.se),mn)<d.se){
                break;
            }
            ss.pop();
        }
        ss.push({x,mn});
        cout<<fixed<<setprecision(3)<<mn<<endl;
    }

}


int32_t main(){
    BERKAY_TUP;
    if (usaco)
    {
        freopen("newbarn.in", "r", stdin);
        freopen("newbarn.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)

bal.cpp: In function 'int32_t main()':
bal.cpp:55:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   55 |         freopen("newbarn.in", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
bal.cpp:56:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   56 |         freopen("newbarn.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10