Stock Exchange

题意翻译

股票交易所里有 $2n$ 种股票，每种股票有两个属性 $a_i,b_i$，在时刻 $t\ge 0$，第 $i$ 种股票的价格为 $a_i*\lfloor t\rfloor+b_i$。 每个时刻可以进行任意次股票交易，在时刻 $t$ 时能够把股票 $i$ 换成股票 $j$ 当且仅当股票 $i$ 在时刻 $t$ 的价格不小于股票 $j$ 在时刻 $t$ 的价格。 现在你手上有 $1$ 到 $n$ 号股票各一张，现在要求的是把这些股票换成 $n+1$ 到 $2n$ 号股票各一张的最早时刻，以及在最早换完股票前提下的最少交易次数。 $1\le n\le 2200,0\le a_i,b_i\le 10^9$

题目描述

Warning: This problem has an unusual memory limit! Bob decided that he will not waste his prime years implementing GUI forms for a large corporation and instead will earn his supper on the Stock Exchange Reykjavik. The Stock Exchange Reykjavik is the only actual stock exchange in the world. The only type of transaction is to take a single share of stock $ x $ and exchange it for a single share of stock $ y $ , provided that the current price of share $ x $ is at least the current price of share $ y $ . There are $ 2n $ stocks listed on the SER that are of interest to Bob, numbered from $ 1 $ to $ 2n $ . Bob owns a single share of stocks $ 1 $ through $ n $ and would like to own a single share of each of $ n+1 $ through $ 2n $ some time in the future. Bob managed to forecast the price of each stock — in time $ t \geq 0 $ , the stock $ i $ will cost $ a_i \cdot \lfloor t \rfloor + b_i $ . The time is currently $ t = 0 $ . Help Bob find the earliest moment in time in which he can own a single share of each of $ n+1 $ through $ 2n $ , and the minimum number of stock exchanges he has to perform in order to do that. You may assume that the Stock Exchange has an unlimited amount of each stock at any point in time.

输入输出格式

输入格式

The first line contains a single integer $ n $ ( $ 1 \leq n \leq 2200 $ ) — the number stocks currently owned by Bob. Each of the next $ 2n $ lines contains integers $ a_i $ and $ b_i $ ( $ 0 \leq a_i, b_i \leq 10^9 $ ), representing the stock price of stock $ i $ .

输出格式

If it is impossible for Bob to achieve his goal, output a single integer $ -1 $ . Otherwise, output two integers $ T $ and $ E $ , where $ T $ is the minimum time in which he can achieve his goal, and $ E $ is the minimum number of exchanges in which he can achieve his goal at time $ T $ .

输入输出样例

输入样例 #1

1
3 10
1 16

输出样例 #1

3 1

输入样例 #2

2
3 0
2 1
1 10
1 11

输出样例 #2

6 3

输入样例 #3

1
42 42
47 47

输出样例 #3

-1

输入样例 #4

8
145 1729363
891 4194243
424 853731
869 1883440
843 556108
760 1538373
270 762781
986 2589382
610 99315884
591 95147193
687 99248788
65 95114537
481 99071279
293 98888998
83 99764577
769 96951171

输出样例 #4

434847 11

输入样例 #5

8
261 261639
92 123277
271 131614
320 154417
97 258799
246 17926
117 222490
110 39356
85 62864876
86 62781907
165 62761166
252 62828168
258 62794649
125 62817698
182 62651225
16 62856001

输出样例 #5

1010327 11

说明

In the first example, Bob simply waits until time $ t = 3 $ , when both stocks cost exactly the same amount. In the second example, the optimum strategy is to exchange stock $ 2 $ for stock $ 1 $ at time $ t = 1 $ , then exchange one share of stock $ 1 $ for stock $ 3 $ at time $ t = 5 $ (where both cost $ 15 $ ) and then at time $ t = 6 $ exchange the second on for the stock number $ 4 $ (when they cost $ 18 $ and $ 17 $ , respectively). Note that he can achieve his goal also with only two exchanges, but this would take total time of $ t = 9 $ , when he would finally be able to exchange the share number $ 2 $ for the share number $ 3 $ . In the third example, Bob can never achieve his goal, as the second stock is always strictly more expensive than the first one.