Submission #1097447

#	Time	Username	Problem	Language	Result	Execution time	Memory
1097447		coolsentenceidontremember	Balloons (CEOI11_bal)	C++17	70 / 100	65 ms	3952 KiB

bal

/*


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*/



#include"bits/stdc++.h"
#pragma GCC optimize("O3", "unroll-loops")
#define ll long long
#define ld long double
#define ff first
#define ss second
#define pii pair<int, int>
#define mp make_pair
#define make_rng mt19937 rng(chrono::steady_clock::now().time_since_epoch().count())
#define make_rng64 mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count())
using namespace std;

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

const double PI = acos(-1);

struct chash{
	const uint64_t C = uint64_t(2e18 * PI) + 71;
	const uint32_t random = chrono::steady_clock::now().time_since_epoch().count();
	size_t operator()(uint64_t x) const {
		return __builtin_bswap64((x^random)*C);
	}
};


double ans[100000];

double get_r(double ax, double ar, double bx){
	double n = (bx - ax)*(bx - ax);
	double d = ar*4;
	return n/d;
}

int main(){
   setIO();
   int n;
   cin >> n;
   stack<pair<double, double>> balls;
   for (int i = 1; i <= n; i++){
   	 double x, r;
   	 cin >> x >> r;
   	 double maxR = r;
   	 while (!balls.empty()){
   	 	pair<double, double> p = balls.top();
   	 	double cur = get_r(p.ff, p.ss, x);
   	 	maxR = min(maxR, cur);
   	 	if (maxR >= p.ss) balls.pop();
   	 	else break;
		}
	 ans[i-1] = maxR;
	 balls.push(mp(x, maxR));
   }
   cout << fixed << setprecision(3);
   for (int i  =0; i < n; i++) cout << ans[i] << '\n';
}

Compilation message (stderr)

bal.cpp: In function 'void setIO(std::string)':
bal.cpp:140:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  140 |  freopen((s+".in").c_str(), "r", stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
bal.cpp:141:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  141 |  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: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10