Submission #356812

#	Time	Username	Problem	Language	Result	Execution time	Memory
356812		jnk	Balloons (CEOI11_bal)	C++17	100 / 100	159 ms	11756 KiB

bal

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

double x[200005], r[200005], res[200005];

int main(){
    
    int n; cin >> n;
    for(int i = 0; i < n; i++)
        scanf("%lf %lf", &x[i], &r[i]);

    res[0] = r[0];
    stack<pair<double,double>> st;
    st.push(make_pair(x[0], res[0]));

    for(int i = 1; i < n; i++){
        double ra = r[i];
        while(!st.empty()){
            auto p = st.top();
            double xdif = x[i] - p.first;
            double r = r - p.second;
            ra = min(ra, xdif * xdif / (4 * p.second));
            if(ra > p.second) st.pop();
            else break;
        }
        res[i] = ra;
        st.push(make_pair(x[i], res[i]));
    }

    for(int i = 0; i < n; i++)
        printf("%.3f\n", res[i]);

	return 0;
}

Compilation message (stderr)

bal.cpp: In function 'int main()':
bal.cpp:31:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   31 |     for(int i = 0; i < n; i++)
      |     ^~~
bal.cpp:34:2: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   34 |  return 0;
      |  ^~~~~~
bal.cpp:11:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   11 |         scanf("%lf %lf", &x[i], &r[i]);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• 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