제출 #1131636

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1131636		monostack	Balloons (CEOI11_bal)	C++20	0 / 100	1 ms	328 KiB

bal

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

#define ld long double

int main(){

    if(fopen("input.txt","r")){
        freopen("input.txt","r",stdin);
        freopen("output.txt","w",stdout);
    }else{
        freopen("bal.in","r",stdin);
        freopen("bal.out","w",stdout);
    }
    cout<<fixed<<setprecision(3);

    int n; cin>>n;
    vector<long double> ans;
    stack<pair<int,long double>> ms;
    for(auto i = 0; i < n; i++){
        int x,r; cin>>x>>r;
        ld r_ = r;
        while(ms.size()){
            r_ = ((ld)(x - ms.top().first)*(ld)(x - ms.top().first))/((ld)4*ms.top().second);
            if(r_ < r) ms.pop();
            else break;
        }
        r_ = min(r_, r+0.000l);
        ms.push({x,r_});
        cout<<ms.top().second<<'\n';
    }
}

컴파일 시 표준 에러 (stderr) 메시지

bal.cpp: In function 'int main()':
bal.cpp:9:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    9 |         freopen("input.txt","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
bal.cpp:10:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   10 |         freopen("output.txt","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
bal.cpp:12:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 |         freopen("bal.in","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~
bal.cpp:13:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |         freopen("bal.out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

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