oj.uz

Submission #1097448

# Submission time Handle Problem Language Result Execution time Memory
1097448 2024-10-07T12:08:12 Z coolsentenceidontremember Balloons (CEOI11_bal) C++17
100 / 100
 124 ms 6996 KB 
/*


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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[200000];

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

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
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB 10 numbers

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB 2 numbers

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB 505 numbers

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB 2000 numbers

Subtask #5
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 772 KB 20000 numbers

Subtask #6
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 35 ms 1360 KB 50000 numbers
2 Correct 29 ms 1112 KB 49912 numbers

Subtask #7
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 64 ms 2128 KB 100000 numbers

Subtask #8
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 75 ms 2388 KB 115362 numbers
2 Correct 65 ms 4436 KB 119971 numbers

Subtask #9
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 103 ms 3612 KB 154271 numbers
2 Correct 111 ms 6992 KB 200000 numbers

Subtask #10
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 124 ms 4688 KB 200000 numbers
2 Correct 111 ms 6996 KB 199945 numbers