#include <bits/stdc++.h>
#define pb push_back
#define mp make_pair
#define F first
#define S second
#define all(v) v.begin(), v.end()
#define sh cin.tie(0); cin.sync_with_stdio(0); cout.tie(0);
#define FILE freopen("test.in", "r", stdin);
#define vprint(v) for (int ii = 0; ii < v.size(); ii++){cout << v[ii] << " ";}
#define debugv(v) if (v.size() != 0) {cout << "[ "; for (int __ = 0; __ < (int)(v.size()) - 1; __++){cout << v[__] << ", ";} cout << v[(int)(v.size()) - 1] << " ]" << endl;} else {cout << "[]" << endl;}
#define debug cout << "-----------------------------------------------" << endl;
#define print1(a) cout << "{ " << a << " }" << endl;
#define print2(a, b) cout << "{ " << a << ", " << b << " }" << endl;
#define print3(a, b, c) cout << "{ " << a << ", " << b << ", " << c << " }" << endl;
#define print4(a, b, c, d) cout << "{ " << a << ", " << b << ", " << c << ", " << d << " }" << endl;
using namespace std;
#define int long long
const double INF = 1e11 + 228;
const int MAXN = 2e5 + 228;
double ans[MAXN];
double intersect1(double x1, double x2, double t1, double t2) {
//print4(x1, x2, t1, (((x2 / (2 * t2)) - (x1 / (2 * t1))) * 2 * t1 * t2) / (t1 - t2));
return ((((x2 / (2 * t2)) - (x1 / (2 * t1))) * 2 * t1 * t2) / (t1 - t2));
}
signed main()
{
#ifdef LOCAL
FILE;
#endif
sh;
int n;
cin >> n;
vector<pair<int, int>> v;
for (int i = 0; i < n; i++) {
int aa, bb;
cin >> aa >> bb;
v.pb({aa, bb});
}
vector<pair<double, double>> s;
vector<double> x1;
for (int i = 0; i < n; i++) {
double now = v[i].S;
int id = upper_bound(all(x1), (double)v[i].F) - x1.begin();
/*print2(i, id);
for (auto oo : s) {
cout << oo.S << ' ';
}
cout << endl;*/
if (s.size() > 0) {
assert((int)(s.size()) - id - 1 >= 0);
//print4("t", s.size(), id, x1.size());
pair<double, double> to = s[s.size() - id - 1];
double cl = (to.S * to.S) / (4 * to.F) + (v[i].F * v[i].F) / (4 * to.F) - (2 * v[i].F * to.S) / (4 * to.F);
now = min(now, cl);
}
while (s.size() > 0 && s.back().F <= now) {
s.pop_back();
}
while (x1.size() + 1 > s.size() && s.size() != 0) {
x1.pop_back();
}
if (s.size() == 0) {
x1.clear();
}
while (s.size() >= 2 && x.back() <= intersect1(s.back().S, (double)v[i].F, sqrt(s.back().F), sqrt(now))) {
s.pop_back();
x1.pop_back();
}
ans[i] = now;
//print1(now);
if (s.size() > 0) {
x1.pb(intersect1(s.back().S, (double)v[i].F, sqrt(s.back().F), sqrt(now)));
}
//print1("ok");
s.pb({now, (double)v[i].F});
}
for (int i = 0; i < n; i++) {
cout << fixed << setprecision(4) << ans[i] << '\n';
}
return 0;
}
Compilation message
bal.cpp: In function 'int main()':
bal.cpp:68:27: error: 'x' was not declared in this scope
while (s.size() >= 2 && x.back() <= intersect1(s.back().S, (double)v[i].F, sqrt(s.back().F), sqrt(now))) {
^
