Submission #954057

#	Time	Username	Problem	Language	Result	Execution time	Memory
954057		blackslex	Balloons (CEOI11_bal)	C++17	100 / 100	90 ms	8500 KiB

bal

#include<bits/stdc++.h>

using namespace std;

int n;

int main() {
    scanf("%d", &n);
    vector<int> x(n), r(n);
    vector<double> dp(n);
    // dp[i] = min {0<=j<i} {(x[i]-x[j])*(x[i]-x[j]) / 4*dp[j]}
    for (int i = 0; i < n; i++) scanf("%d %d", &x[i], &r[i]), dp[i] = (double) r[i];
    stack<int> st;
    for (int i = 0; i < n; i++) {
        while (!st.empty() && (dp[i] = min(dp[i], (double) 1.0 * (x[st.top()] - x[i]) * (x[st.top()] - x[i]) / (4.0 * dp[st.top()]))) >= dp[st.top()]) st.pop();
        st.emplace(i);
    }
    for (int i = 0; i < n; i++) printf("%.3lf\n", dp[i]);
}

Compilation message (stderr)

bal.cpp: In function 'int main()':
bal.cpp:8:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    8 |     scanf("%d", &n);
      |     ~~~~~^~~~~~~~~~
bal.cpp:12:38: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 |     for (int i = 0; i < n; i++) scanf("%d %d", &x[i], &r[i]), dp[i] = (double) 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