Submission #964034

#	Time	Username	Problem	Language	Result	Execution time	Memory
964034		Neco_arc	Balloons (CEOI11_bal)	C++17	100 / 100	172 ms	15328 KiB

bal

#include <bits/stdc++.h>

#define ll long long
#define all(x) x.begin(), x.end()
#define Neco "Balloons"
#define resp(x) sort(all(x)), x.resize(unique(all(x)) - x.begin())
#define getbit(x,i) ((x >> i)&1)
#define _left id * 2, l, mid
#define _right id * 2 + 1, mid + 1, r
#define cntbit(x) __builtin_popcountll(x)
#define fi(i, a, b) for(int i = a; i <= b; i++)
#define fid(i, a, b) for(int i = a; i >= b; i--)
#define maxn (int) 2e5 + 7

using namespace std;

const ll mod = 1e9 + 7; //972663749
const ll base = 911382323;
typedef long double ld;

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());

ll GetRandom(ll l, ll r)
{
    return uniform_int_distribution<ll> (l, r)(rng);
}

int n;
pair<ld, ld> a[maxn];
ld ans[maxn];
int q[maxn], top;

void solve()
{

    cin >> n;
    fi(i, 1, n) cin >> a[i].first >> a[i].second;

    fi(i, 1, n) {
        ld R = a[i].second;
        while(top) {
            int t = q[top];
            ld val = (a[t].first - a[i].first) * (a[t].first - a[i].first) / (4 * ans[t]);
            R = min(R, val);

            if(R > ans[t]) --top;
            else break;
        }
        ans[i] = R, q[++top] = i;
    }

    fi(i, 1, n) cout << fixed << setprecision(3) << ans[i] << '\n';


}


int main()
{

    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    if(fopen(Neco".inp", "r")) {
        freopen(Neco".inp", "r", stdin);
        freopen(Neco".out", "w", stdout);
    }


    int nTest = 1;
//    cin >> nTest;


    while(nTest--)
    {
        solve();
    }


    return 0;
}

Compilation message (stderr)

bal.cpp: In function 'int main()':
bal.cpp:66:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   66 |         freopen(Neco".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
bal.cpp:67:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   67 |         freopen(Neco".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