Submission #1236411

#	Time	Username	Problem	Language	Result	Execution time	Memory
1236411		enxiayy	Balloons (CEOI11_bal)	C++20	100 / 100	149 ms	4996 KiB

bal

#include <bits/stdc++.h>
#define fi first
#define se second
#define all(x) x.begin(), x.end()
#define compact(v) v.erase(unique(all(v)), v.end())
#define dbg(v) "[" #v " = " << (v) << "]"
#define el "\n"
#define ld long double

using namespace std;
typedef long long ll;

mt19937_64 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
long long randRange(long long l, long long r){ return uniform_int_distribution<long long>(l,r)(rng); }

const int N = 2e5 + 5;

long double cost(pair<ld, ld> last, ld x) {
    return (x - last.first) * (x - last.first) / (4 * last.second);
}

int n;
ld ans[N];

void solve() {
    cin >> n;
    stack < pair<ld, ld> > st;
    for(int i = 1; i <= n; ++i) {
        ld x, r; cin >> x >> r;
        ld curR = r;
        
        while(st.size() > 0) {
            curR = min(curR, cost(st.top(), x));
            
            if (curR >= st.top().second) {
                st.pop();
                continue;
            }
            else break;
        }

        st.push({x, curR});
        ans[i] = curR;
    }

    for(int i = 1; i <= n; ++i) cout << fixed << setprecision(3) << ans[i] << " ";
}

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);

    #define task "bongbong" 
    if(fopen(task".inp", "r")) {
        freopen(task".inp", "r", stdin);
        freopen(task".out", "w", stdout);
    }
    solve();

    return 0;
}

/*

*/

Compilation message (stderr)

bal.cpp: In function 'int 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(task".inp", "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(task".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