제출 #607261

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
607261		Duy_e	Balloons (CEOI11_bal)	C++14	0 / 100	3 ms	468 KiB

bal

#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;
    // cout << a << ' ' << b << ' ' << c << '\n';
    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];
        for (int j = i - 1; j >= 1; j --)
            if (touch(j, i)) {
                r[i] = min(r[i], cal(j, i));
            }
        cout << setprecision(3) << fixed << r[i] << '\n';
    }

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

컴파일 시 표준 에러 (stderr) 메시지

bal.cpp:51:9: warning: "/*" within comment [-Wcomment]
   51 | /**  /\_/\
      |          
bal.cpp: In function 'int main()':
bal.cpp:34:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   34 |         freopen(file".inp", "r", stdin); freopen(file".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
bal.cpp:34:49: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   34 |         freopen(file".inp", "r", stdin); freopen(file".out", "w", stdout);
      |                                          ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 10
• Subtask 3: 0 / 10
• Subtask 4: 0 / 10
• Subtask 5: 0 / 10
• Subtask 6: 0 / 10
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10