Submission #1302096

#	Time	Username	Problem	Language	Result	Execution time	Memory
1302096		hoa208	Balloons (CEOI11_bal)	C++20	100 / 100	120 ms	8052 KiB

bal

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define FOR(i, a, b) for (int i = (a), _b = (b); i <= _b; i++)
#define FORD(i, b, a) for (int i = (b), _a = (a); i >= _a; i--)
#define pa pair<ll, ll>
#define fi first
#define se second
#define bit(mask, j) ((mask >> j) & 1)
const   ll mod = 1e9 + 7;
const   ll INF = 1e18;
//--------------------------------------------------------------------

const ll N = 200002;
long double x[N], r[N];
void hbmt() {
    ll n;
    cin >> n;
    cout << setprecision(3) << fixed;
    stack<int> st;
    FOR(i, 1, n) {
        cin >> x[i] >> r[i];
        while(!st.empty()) {
            ll j = st.top();
            long double val = (x[i] - x[j]) * (x[i] - x[j]);
            long double val2 = 4.0 * r[j];
            val = val / val2;
            r[i] = min(val, r[i]);
            if(r[i] >= r[j]) st.pop();
            else break;
        }
        st.push(i);
        cout << r[i] << '\n';
    }
}

int main() {

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

    #define NAME "hbmt"
    if(fopen(NAME".inp", "r")) {
        freopen(NAME".inp", "r", stdin);
        freopen(NAME".out", "w", stdout);
    }

    //int t;cin>>t;while(t--)
    hbmt();
    return 0;
}

Compilation message (stderr)

bal.cpp: In function 'int main()':
bal.cpp:44:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   44 |         freopen(NAME".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
bal.cpp:45:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   45 |         freopen(NAME".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