Submission #547043

#	Time	Username	Problem	Language	Result	Execution time	Memory
547043		mgl_diamond	Balloons (CEOI11_bal)	C++14	0 / 100	373 ms	1740 KiB

bal

#include <bits/stdc++.h>

using namespace std;
using ll = long long;

#define ii pair<int, int>
#define dd pair<double, double>
#define iii pair<int, ii>
#define fi first
#define se second

#define all(x) (x).begin(), (x).end()
#define debug(x) cout << "> " << #x << ": " << x << '\n'

template<class T> bool maximize(T&a, T b) { if (a<b) return a=b, 1; return 0; }
template<class T> bool minimize(T&a, T b) { if (a>b) return a=b, 1; return 0; }

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

int n;
vector<dd> st;

int main() {
	cin >> n;
	for(int i=0; i<n; ++i) {
		double x, r; cin >> x >> r;
		if (i==0) {
			st.push_back({x, r});
			cout << r << "\n";
			continue;
		}
		for(int i=st.size()-1; i>=0; --i) {
			double x1=st[i].fi;
			double r1=st[i].se;
			minimize(r, (x1-x)*(x1-x)/(r1*4));
		}
		while (st.back().se<r) st.pop_back();
		st.push_back({x, r});
		cout << r << "\n";
	}
}

Compilation message (stderr)

bal.cpp: In function 'void setIO(std::string)':
bal.cpp:20:26: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   20 |  if (name.size()) freopen((name+".in").c_str(), "r", stdin);
      |                   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
bal.cpp:21:26: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   21 |  if (name.size()) freopen((name+".out").c_str(), "w", stdout);
      |                   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 10
• Subtask 3: 0 / 10
• Subtask 4: 0 / 10
• Subtask 5: 0 / 10
• Subtask 6: 0 / 10
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10