Submission #407138

#	Time	Username	Problem	Language	Result	Execution time	Memory
407138		julian33	Balloons (CEOI11_bal)	C++14	100 / 100	172 ms	5384 KiB

bal

#include <bits/stdc++.h>

using namespace std;

#define pb push_back
#define sz(x) (int)(x.size())
typedef long long ll;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
template<typename T> inline void maxa(T& a,T b){a=max(a,b);}
template<typename T> inline void mina(T& a,T b){a=min(a,b);}

const int mxN=2e5+5;

stack<pair<ll,double>> stk;
ll n,r,x;

int main(){
    cin.sync_with_stdio(0);
    cin.tie(0); cout.tie(0);

    #ifdef LOCAL
        freopen("input.txt","r",stdin);
        freopen("output.txt","w",stdout);
    #endif

    cin>>n;
    for(int i=0;i<n;i++){
        cin>>x>>r;
        double ans=r;
        while(sz(stk)){
            pair<ll,double> cur=stk.top();
            double nr=(cur.first-x)*(cur.first-x)/(4*cur.second);
            mina(ans,nr);
            if(ans>=cur.second)
                stk.pop();
            else
                break;
        }
        cout<<fixed<<setprecision(3)<<ans<<"\n";
        stk.push({x,ans});
    }
}

• 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