#include <iostream>
#include <math.h>
#include <stack>
using namespace std;
struct bb {
long double x, r;
bb () {}
bb (long double X, long double R) {
x = X;
r = R;
}
};
int n;
bb k;
stack <bb> st, tmp;
long double dis(bb A, bb B) {
return sqrt((A.x - B.x) * (A.x - B.x) + (A.r - B.r) * (A.r - B.r));
}
long double Find(bb kt) {
return (kt.x - k.x) * (kt.x - k.x) / (4.0 * kt.r);
}
int main() {
cin.tie(0); cout.tie(0);
ios_base::sync_with_stdio(false);
cin >> n;
for (int i = 1; i <= n; ++i) {
cin >> k.x >> k.r;
long double ans = k.r;
while (!st.empty()) {
ans = min(ans, Find(st.top()));
if (ans >= st.top().r) {
st.pop();
continue;
}
break;
}
st.push(bb(k.x, ans));
printf("%.10Lf\n", ans);
}
return 0;
}
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