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답안 #607273

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
607273 2022-07-26T14:19:51 Z Duy_e Balloons (CEOI11_bal) C++14
0 / 100
 3 ms 396 KB 
#include <bits/stdc++.h>
#define ll long long
#define pii pair<ll, ll>
#define st first
#define nd second
#define file "test"
using namespace std;
const long long INF = 1e18;
const long long N = 2e5 + 5;
const long long eps = 1e-6;
stack <int> st;
ll x[N], n;
double r[N];

bool touch(int i, int j) {
    double c = r[i] + r[j]; c = c * c;
    double a = r[i] - r[j]; a = a * a;
    double b = x[j] - x[i]; b = b * b;
    return c - a >= b;
}

double cal(int i, int j) {
    if (i == 0) return r[j];
    double a = r[i], b = x[j] - x[i];
    double ans = b * b / ((double)4.0 * a);
    return min(ans, r[j]);
}

int main()
{
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    #ifndef ONLINE_JUDGE
        freopen(file".inp", "r", stdin); freopen(file".out", "w", stdout);
    #endif
    
    cin >> n;

    st.push(0);
    for (int i = 1; i <= n; i ++) {
        cin >> x[i] >> r[i];

        while (st.size() > 1 && !touch(st.top(), i) && r[i] >= r[st.top()]) st.pop();

        while (st.size() > 1 && touch(st.top(), i)) {
            double res = cal(st.top(), i);
            if (res > r[i]) continue;
            st.pop();
            r[i] = res;
        }
        st.push(i);
        cout << setprecision(3) << fixed << r[i] << '\n';
    }

    return 0;
}    
/**  /\_/\
*   (= ._.)
*   / >🍵 \>🍮
**/

Compilation message

bal.cpp:56:9: warning: "/*" within comment [-Wcomment]
   56 | /**  /\_/\
      |          
bal.cpp: In function 'int main()':
bal.cpp:33:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   33 |         freopen(file".inp", "r", stdin); freopen(file".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
bal.cpp:33:49: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   33 |         freopen(file".inp", "r", stdin); freopen(file".out", "w", stdout);
      |                                          ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 2 ms 340 KB Unexpected end of file - double expected
2 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 2 ms 340 KB Unexpected end of file - double expected
2 Halted 0 ms 0 KB -

Subtask #3
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 2 ms 340 KB Unexpected end of file - double expected
2 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 3 ms 340 KB Unexpected end of file - double expected
2 Halted 0 ms 0 KB -

Subtask #5
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 2 ms 340 KB Unexpected end of file - double expected
2 Halted 0 ms 0 KB -

Subtask #6
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 2 ms 340 KB Unexpected end of file - double expected
2 Halted 0 ms 0 KB -

Subtask #7
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 2 ms 396 KB Unexpected end of file - double expected
2 Halted 0 ms 0 KB -

Subtask #8
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 2 ms 340 KB Unexpected end of file - double expected
2 Halted 0 ms 0 KB -

Subtask #9
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 2 ms 340 KB Unexpected end of file - double expected
2 Halted 0 ms 0 KB -

Subtask #10
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 2 ms 340 KB Unexpected end of file - double expected
2 Halted 0 ms 0 KB -