제출 #657628

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
657628		cpp219	Balloons (CEOI11_bal)	C++17	100 / 100	230 ms	5556 KiB

bal

#include<bits/stdc++.h>
#define ll long long
#define ld double
#define fs first
#define sc second
#define debug(y) cout<<y,exit(0)
using namespace std;
typedef pair<ll,ll> LL;
const ll N = 1e6 + 9;
const ll inf = 1e18 + 7;

ll n;
stack<pair<ld,ld>> st;

int main(){
    ios_base::sync_with_stdio(NULL); cin.tie(0); cout.tie(0);
    #define task "test"
    if (fopen(task".inp","r")){
        freopen(task".inp","r",stdin);
        //freopen(task".out","w",stdout);
    }
    cin>>n;
    for (ll i = 1;i <= n;i++){
        ld x,r; cin>>x>>r;
        while(!st.empty()){
            ld x1 = st.top().fs,r1 = st.top().sc;
            r = min(r,((x1 - x)*(x1 - x))/(4*r1));
            if (r < r1) break;
            else st.pop();
        }
        st.push({x,r});
        cout<<fixed<<setprecision(3)<<r<<"\n";
    }

}
/* be confident */

컴파일 시 표준 에러 (stderr) 메시지

bal.cpp: In function 'int main()':
bal.cpp:19:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |         freopen(task".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

• 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