分类存档: ACM/ICPC

SPOJ Number Steps 解题报告

1112. Number Steps

Time Limit: 2s Source limit: 50000B

Description

Starting from point (0,0) on a plane, we have written all non-negative integers 0, 1, 2,… as shown in the figure. For example, 1, 2, and 3 has been written at points (1,1), (2,0), and (3, 1) respectively and this pattern has continued.

You are to write a program that reads the coordinates of a point (x, y), and writes the number (if any) that has been written at that point. (x, y) coordinates in the input are in the range 0…10000.

Input

The first line of the input is N, the number of test cases for this problem. In each of the N following lines, there is x, and y representing the coordinates (x, y) of a point.

Output

For each point in the input, write the number written at that point or write No Number if there is none.

Sample Input

3
4 2
6 6
3 4

Sample Output

6
12
No Number

继续水题,而且是以前做过的,找规律即可。[……]

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SPOJ Adding Reversed Numbers 解题报告

42. Adding Reversed Numbers

Time Limit: 5s Source limit: 50000B

Description

The Antique Comedians of Malidinesia prefer comedies to tragedies. Unfortunately, most of the ancient plays are tragedies. Therefore the dramatic advisor of ACM has decided to transfigure some tragedies into comedies. Obviously, this work is very hard because the basic sense of the play must be kept intact, although all the things change to their opposites. For example the numbers: if any number appears in the tragedy, it must be converted to its reversed form before being accepted into the comedy play.
Reversed number is a number written in arabic numerals but the order of digits is reversed. The first digit becomes last and vice versa. For example, if the main hero had 1245 strawberries in the tragedy, he has 5421 of them now. Note that all the leading zeros are omitted. That means if the number ends with a zero, the zero is lost by reversing (e.g. 1200 gives 21). Also note that the reversed number never has any trailing zeros.
ACM needs to calculate with reversed numbers. Your task is to add two reversed numbers and output their reversed sum. Of course, the result is not unique because any particular number is a reversed form of several numbers (e.g. 21 could be 12, 120 or 1200 before reversing). Thus we must assume that no zeros were lost by reversing (e.g. assume that the original number was 12).

Input

The input consists of N cases (equal to about 10000). The first line of the input contains only positive integer N. Then follow the cases. Each case consists of exactly one line with two positive integers separated by space. These are the reversed numbers you are to add.

Output

For each case, print exactly one line containing only one integer – the reversed sum of two reversed numbers. Omit any leading zeros in the output.

Sample Input

5 5
3
24 1
4358 754
305 794

Sample Output

34
1998
1

水题,把数字翻转过来,相加以后再翻转过去就可以了。一个函数解决。[……]

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SPOJ Prime Generator 解题报告

2. Prime Generator

Time Limit: 6s Source limit: 50000B

Description

Peter wants to generate some prime numbers for his cryptosystem. Help him! Your task is to generate all prime numbers between two given numbers!

Input

The input begins with the number t of test cases in a single line (t<=10). In each of the next t lines there are two numbers m and n (1 <= m <= n <= 1000000000, n-m<=100000) separated by a space.

Output

For every test case print all prime numbers p such that m <= p <= n, one number per line, test cases separated by an empty line.

Sample Input

5 5
2
1 10
3 5

Sample Output

2
3
5
7
3
5

最近在看一些有限元方面的书,前人所写的程序几乎清一色的都是用Fortran,所以不得不复习一下Fortran了。据说同样的算法用Fortran实现的会比C/C++实现的快25%(当然我没测试过)。不过要找一个支持Fortran的OJ还真是不容易,因为Poj的Fortran编译器不知道出了什么问题,怎么都编译不了,所以只好选择SPOJ了,不过SPOJ支持的语言还真是多,简直可以说是无所不包。[……]

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PKU 1088 解题报告

滑雪

Time Limit: 1000MS Memory Limit: 65536K

Description

Michael喜欢滑雪百这并不奇怪, 因为滑雪的确很刺激。可是为了获得速度,滑的区域必须向下倾斜,而且当你滑到坡底,你不得不再次走上坡或者等待升降机来载你。Michael想知道载一个区域中最长底滑坡。区域由一个二维数组给出。数组的每个数字代表点的高度。下面是一个例子

 1  2  3  4  5
16 17 18 19  6
15 24 25 20  7
14 23 22 21  8
13 12 11 10  9

一个人可以从某个点滑向上下左右相邻四个点之一,当且仅当高度减小。在上面的例子中,一条可滑行的滑坡为24-17-16-1。当然25-24-23-…-3-2-1更长。事实上,这是最长的一条。

Input

输入的第一行表示区域的行数R和列数C(1 <= R,C <= 100)。下面是R行,每行有C个整数,代表高度h,0<=h<=10000。

Output

输出最长区域的长度。

Sample Input

5 5
1 2 3 4 5
16 17 18 19 6
15 24 25 20 7
14 23 22 21 8
13 12 11 10 9

Sample Output

25

Source

SHTSC 2002

太长时间没有写代码了,我已经离这个领域越来越远了.快毕业了,编程对于我的意义也不是很大了,我将来所从事的行业用到程序设计的机会不会很多.如慧慧所说,ACM,程序设计什么的对于我也只剩一点精神上的东西了.

[……]

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ZOJ 1514 解题报告

Fake Tickets

Time Limit: 1 Seconds Memory Limit: 32768 KB

Your school organized a big party to celebrate your team brilliant win in the prestigious, worldfamous ICPC (International Collegiate Poetry Contest). Everyone in your school was invited for an evening which included cocktail, dinner and a session where your team work was read to the audience. The evening was a success – many more people than you expected showed interested in your poetry – although some critics of yours said it was food rather than words that attracted such an audience.

Whatever the reason, the next day you found out why the school hall had seemed so full: the school director confided he had discovered that several of the tickets used by the guests were fake. The real tickets were numbered sequentially from 1 to N (N <= 10000). The director suspects some people had used the school scanner and printer from the Computer Room to produce copies of the real tickets. The director gave you a pack with all tickets collected from the guests at the party's entrance, and asked you to determine how many tickets in the pack had 'clones', that is, another ticket with the same sequence number.

Input

The input contains data for several test cases. Each test case has two lines. The first line contains two integers N and M which indicate respectively the number of original tickets and the number of persons attending the party (1 <= N <= 10000 and 1 <= M <= 20000). The second line of a test case contains M integers Ti representing the ticket numbers in the pack the director gave you (1 <= Ti <= N). The end of input is indicated by N = M = 0.

Output

For each test case your program should print one line, containing the number of tickets in the pack that had another ticket with the same sequence number.

[……]

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ZJU 1101 解题报告

Gamblers

Time Limit: 1 Seconds Memory Limit: 32768 KB

A group of n gamblers decide to play a game:

At the beginning of the game each of them will cover up his wager on the table and the assitant must make sure that there are no two gamblers have put the same amount. If one has no money left, one may borrow some chips and his wager amount is considered to be negative. Assume that they all bet integer amount of money.

Then when they unveil their wagers, the winner is the one who’s bet is exactly the same as the sum of that of 3 other gamblers. If there are more than one winners, the one with the largest bet wins.

For example, suppose Tom, Bill, John, Roger and Bush bet $2, $3, $5, $7 and $12, respectively. Then the winner is Bush with $12 since $2 + $3 + $7 = $12 and it’s the largest bet.

Input

Wagers of several groups of gamblers, each consisting of a line containing an integer 1 <= n <= 1000 indicating the number of gamblers in a group, followed by their amount of wagers, one per line. Each wager is a distinct integer between -536870912 and +536870911 inclusive. The last line of input contains 0.

Output

For each group, a single line containing the wager amount of the winner, or a single line containing “no solution”.

[……]

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ZJU 1152 解题报告

A Mathematical Curiosity

Time Limit: 1 Seconds Memory Limit: 32768 KB

Given two integers n and m, count the number of pairs of integers (a,b) such that 0 < a < b < n and (a^2+b^2 +m)/(ab) is an integer.

This problem contains multiple test cases!

The first line of a multiple input is an integer N, then a blank line followed by N input blocks. Each input block is in the format indicated in the problem description. There is a blank line between input blocks.

The output format consists of N output blocks. There is a blank line between output blocks.

Input

You will be given a number of cases in the input. Each case is specified by a line containing the integers n and m. The end of input is indicated by a case in which n = m = 0. You may assume that 0 < n <= 100.

Output

For each case, print the case number as well as the number of pairs (a,b) satisfying the given property. Print the output for each case on one line in the format as shown below.

[……]

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ZJU 1003 解题报告

Crashing Balloon

Time Limit: 1 Seconds Memory Limit: 32768 KB

On every June 1st, the Children’s Day, there will be a game named “crashing balloon” on TV. The rule is very simple. On the ground there are 100 labeled balloons, with the numbers 1 to 100. After the referee shouts “Let’s go!” the two players, who each starts with a score of “1”, race to crash the balloons by their feet and, at the same time, multiply their scores by the numbers written on the balloons they crash. After a minute, the little audiences are allowed to take the remaining balloons away, and each contestant reports his\her score, the product of the numbers on the balloons he\she’s crashed. The unofficial winner is the player who announced the highest score.

Inevitably, though, disputes arise, and so the official winner is not determined until the disputes are resolved. The player who claims the lower score is entitled to challenge his\her opponent’s score. The player with the lower score is presumed to have told the truth, because if he\she were to lie about his\her score, he\she would surely come up with a bigger better lie. The challenge is upheld if the player with the higher score has a score that cannot be achieved with balloons not crashed by the challenging player. So, if the challenge is successful, the player claiming the lower score wins.

So, for example, if one player claims 343 points and the other claims 49, then clearly the first player is lying; the only way to score 343 is by crashing balloons labeled 7 and 49, and the only way to score 49 is by crashing a balloon labeled 49. Since each of two scores requires crashing the balloon labeled 49, the one claiming 343 points is presumed to be lying.

On the other hand, if one player claims 162 points and the other claims 81, it is possible for both to be telling the truth (e.g. one crashes balloons 2, 3 and 27, while the other crashes balloon 81), so the challenge would not be upheld.

By the way, if the challenger made a mistake on calculating his/her score, then the challenge would not be upheld. For example, if one player claims 10001 points and the other claims 10003, then clearly none of them are telling the truth. In this case, the challenge would not be upheld.

Unfortunately, anyone who is willing to referee a game of crashing balloon is likely to get over-excited in the hot atmosphere that he\she could not reasonably be expected to perform the intricate calculations that refereeing requires. Hence the need for you, sober programmer, to provide a software solution.

[……]

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ZJU 2420 解题报告

Calendar

Time Limit: 1 Seconds Memory Limit: 32768 KB

A calendar is a system for measuring time, from hours and minutes, to months and days, and finally to years and centuries. The terms of hour, day, month, year and century are all units of time measurements of a calender system.

According to the Gregorian calendar, which is the civil calendar in use today, years evenly divisible by 4 are leap years, with the exception of centurial years that are not evenly divisible by 400. Therefore, the years 1700, 1800, 1900 and 2100 are not leap years, but 1600, 2000, and 2400 are leap years.

Given the number of days that have elapsed since January 1, 2000 A.D, your mission is to find the date and the day of the week.

Input

The input consists of lines each containing a positive integer, which is the number of days that have elapsed since January 1, 2000 A.D. The last line contains an integer -1, which should not be processed. You may assume that the resulting date won’t be after the year 9999.

Output

For each test case, output one line containing the date and the day of the week in the format of “YYYY-MM-DD DayOfWeek”, where “DayOfWeek” must be one of “Sunday”, “Monday”, “Tuesday”, “Wednesday”, “Thursday”, “Friday” and “Saturday”.

[……]

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ZJU 3464 解题报告

Rugby Football

Time Limit: 2 Seconds Memory Limit: 65536 KB

CM is a member of Rugby football club of ZJU. He loves to play the game. Every Friday afternoon there is a club training of skills. CM wants to make it more effective.

In the training, N club members including CM stand at staring line in a row. The maximum velocity of the i-th player is Vi. The distance between the line and touchdown zone is L. The goal is to send the ball to touchdown zone. They can pass the ball to others but forward passing is illegal. If someone reaches touchdown zone with ball, the team scores and it will be an effective training.

This picture illustrate the rule of passing ball.

But the way to scoring is not easy because of crazy opponents. Any player with the ball cannot rush more than T seconds or he will be tackled. And he cannot be passed again because he will be very tired after sprinting; even have not for T seconds enough. At the beginning CM can choose who takes the ball first. Now CM wants to know whether they can score and how fast they can.

[……]

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