Submission #1101903

#	Time	Username	Problem	Language	Result	Execution time	Memory
1101903		InvMOD	Balloons (CEOI11_bal)	C++14	100 / 100	133 ms	14940 KiB

bal

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

#define fi first
#define se second
#define gcd __gcd
#define vsz(v) (int) v.size()
#define pb push_back
#define pi pair<int,int>
#define all(v) (v).begin(), (v).end()
#define compact(v) (v).erase(unique(all(v)), (v).end())
#define FOR(i, a, b) for(int i = (a); i <= (b); i++)
///#define int long long

using ll = long long;
using ld = long double;
using ull = unsigned long long;

template<typename T> bool ckmx(T& a, const T& b){if(a < b) return a = b, true; return false;}
template<typename T> bool ckmn(T& a, const T& b){if(a > b) return a = b, true; return false;}

const int N = 2e5+5;
const ll MOD = 1e9+7;
const ld inf = 1e18;

ld square(ld x){
    return (x * x);
}

int n;
ld x[N], r[N];
ld radius[N];

ld calc_dist(ld x1, ld r1, ld x2){
    ld r2 = square(x1 - x2) / (4* r1);
    return r2;
}

void solve()
{
    cin >> n;
    for(int i = 1; i <= n; i++){
        cin >> x[i] >> r[i];
    }

    stack<int> st;
    for(int i = 1; i <= n; i++){
        ld cur_rad = r[i];

        while(!st.empty()){
            int j = st.top();

            cur_rad = min(cur_rad, calc_dist(x[j], radius[j], x[i]));
            if(cur_rad >= radius[j]){
                st.pop();
            }
            else{
                break;
            }
        }

        radius[i] = cur_rad;
        st.push(i);
    }

    for(int i = 1; i <= n; i++){
        cout << fixed << setprecision(3) << radius[i] <<"\n";
    }
}

signed main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    #define name "InvMOD"
    if(fopen(name".INP", "r")){
        freopen(name".INP","r",stdin);
        freopen(name".OUT","w",stdout);
    }

    int t = 1; //cin >> t;
    while(t--) solve();
    return 0;
}

Compilation message (stderr)

bal.cpp: In function 'int main()':
bal.cpp:79:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   79 |         freopen(name".INP","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
bal.cpp:80:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   80 |         freopen(name".OUT","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