题号：NC16631
时间限制：C/C++/Rust/Pascal 2秒，其他语言4秒
空间限制：C/C++/Rust/Pascal 256 M，其他语言512 M
Special Judge, 64bit IO Format: %lld
时间限制：C/C++/Rust/Pascal 2秒，其他语言4秒
空间限制：C/C++/Rust/Pascal 256 M，其他语言512 M
Special Judge, 64bit IO Format: %lld
题目描述
There is an infinite plane. White Cloud has n lines which are not parallel to the Oy axis. These lines in the plane are in the form y=ax+b.
White Rabbit will have a trip in the plane. It will start at time 0 and go straight along a line. specifically, White Rabbit uses 2 parameters C and D,denoting that at time x, White Rabbit is at the position(x,C*x+D).
If at some time, White Rabbit is located at one of White Cloud's lines, White Cloud will receive a message immediately.
White Rabbit will have a trip in the plane. It will start at time 0 and go straight along a line. specifically, White Rabbit uses 2 parameters C and D,denoting that at time x, White Rabbit is at the position(x,C*x+D).
If at some time, White Rabbit is located at one of White Cloud's lines, White Cloud will receive a message immediately.
White Rabbit has m pairs (C[i],D[i]) for i=1..m. For each i=1..m, White Cloud wants to know if White Rabbit uses (C[i],D[i]) , when is the last time White Cloud can receive a message.
输入描述:
The first line of input contains an integer n. (n<=50000)
For the next n lines, the i-th line contains 2 integers A[i], B[i], describing the i-th line. (-1e9<=A[i],B[i]<=1e9)
All numbers A[i] are different.
The next line contains an integer m. (m<=50000)
For the next m lines, the i-th line contains 2 integers C[i],D[i], describing the i-th pair.(-2e9<=C[i],D[i]<=2e9)
Each C[j] is different from any of the numbers A[i].
Each D[j] is different from any of the numbers B[i].
输出描述:
Print m lines. The i-th line contains a real number with at least 6 digits after the decimal point, denoting the latest time White Cloud can receive a message. Your answer must be correct within an absolute error of 1e-6.
If White Cloud can't receive any message during White Rabbit's trip,print a string "No cross".
