Submission #488122

#	Time	Username	Problem	Language	Result	Execution time	Memory
488122		Codurr	Balloons (CEOI11_bal)	C++14	100 / 100	193 ms	8508 KiB

bal

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

#define int long long //int main to signed main (Avoid if TC very close to limit)
#define ll long long
#define sz(x) (int)((x).size())
#define all(x) (x).begin(),(x).end()
#define rall(x) (x).rbegin(),(x).rend()
#define f first
#define s second

void setIO(string s="") {
    ios_base::sync_with_stdio(0); cin.tie(0);
    if(sz(s)) {
        freopen((s+".in").c_str(),"r",stdin);
        freopen((s+".out").c_str(),"w",stdout);
    }
}

//Imp consts
const int MOD=1e9+7;
const int MAXN=2e5+1;
const int INF=1e18+5;
const double pi=3.14159265358979323846;
const double ep=1e-20;

signed main() {
    setIO();
    int n;
    cin>>n;
    vector<pair<int,int>> v(n);
    stack<pair<int,double>> s;
    cout<<fixed<<setprecision(3);
    for(int i=0;i<n;i++) {
    	int x;
    	double r;
    	cin>>x>>r;
    	if(!i) {
    		cout<<r<<'\n';
    		s.push({x,r});
    	}
    	else {
    		while(!s.empty()) {
    			int x1=s.top().f;
    			double r1=s.top().s;
    			r=min(r,(double)((x-x1)*(x-x1))/(4.0*r1));
    			if(r>=r1) s.pop();
    			else break;
    		}
    		cout<<r<<"\n";
    		s.push({x,r});
    	}
    }
    
    return 0;
}

Compilation message (stderr)

bal.cpp: In function 'void setIO(std::string)':
bal.cpp:15:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |         freopen((s+".in").c_str(),"r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
bal.cpp:16:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |         freopen((s+".out").c_str(),"w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• 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