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Spreadsheet In 1979, Dan Bricklin and Bob Frankston wrote VisiCalc, the first spreadsheet application. It became a huge success and, at that time, was the killer application for the Ap

Undraw the Trees Input: Standard InputOutput: Standard OutputTime Limit: 2 Seconds Professor Homer has been reported missing. We suspect that his recent research works might have had somethi

Ordering TasksInput: standard inputOutput: standard outputTime Limit: 1 secondMemory Limit: 32 MB John has n tasks to do. Unfortunately, the tasks are not independent and the execution of

Kamal is a Motashota guy. He has got a new job in Chittagong. So, he has moved to Chittagong from Dinajpur. He was getting fatter in Dinajpur as he had no work in his hand there. So, moving to Chittag

Play on WordsSome of the secret doors contain a very interesting word puzzle. The team of archaeologists has to solve it to open that doors. Because there is no other way to open the doors, the pu

Palindromes A regular palindrome is a string of numbers or letters that is the same forward as backward. For example, the string "ABCDEDCBA"is a palindrome because it is the same when

Artificial Intelligence? Physics teachers in high school often think that problems given as text are more demanding than pure computations. After all, the pupils have to read and under

Excuses, Excuses! Judge Ito is having a problem with people subpoenaed for jury duty giving rather lame excuses in order to avoid serving. In order to reduce the amount of time require

Tree's a Crowd Dr William Larch, noted plant psychologist and inventor of the phrase ``Think like a tree--Think Fig'' has invented a new classification system for trees. This is a comp

Searching Quickly BackgroundSearching and sorting are part of the theory and practice of computer science. For example, binary search provides a good example of an easy-to-unde

The Mad Numerologist Numerology is a science that is used by many people to find out a mans personality, sole purpose of life, desires to experience etc. Some calculations of numerology

The Land of JusticeInput: standard inputOutput: standard outputTime Limit: 4 secondsIn the Land of Justice the selling price of everything is fixed all over the country. Nobody can buy a t

(2/3/4)-D Sqr/Rects/Cubes/Boxes?Input: standard inputOutput: standard outputTime Limit: 2 seconds You can see a (4x4) grid below. Can you tell me how many squares and rectangles are hidden t

技巧很实用。

Light, more lightThe ProblemThere is man named "mabu" for switching on-off light in our University. He switches on-off the lights in a corridor. Every bulb has its own toggle switch.

Just the Facts The expression N!, read as ``N factorial," denotes the product of the first N positive integers, where N is nonnegative. So, for example,NN!0

Pseudo-Random Numbers Computers normally cannot generate really random numbers, but frequently are used to generate sequences of pseudo-random numbers. These are generated by some algo

BilliardIn a billiard table with horizontal side a inches and vertical side b inches, a ball is launched from the middle of the table. After s > 0 seconds the ball returns to the point from wh

The Blocks Problem Background Many areas of Computer Science use simple, abstract domains for both analytical and empirical studies. For example, an early AI study of planning

test#include#include#includeusing namespace std;#define N 10000int sum;char *move;void build(int n);int cut(char *t,int f) // 对 'p' 与 'f' 相遇时，'p'的后续子树进行删除{ for(int i=0;

The Falling Leaves Each year, fall in the North region is accompanied by the brilliant colors of the leaves on the trees, followed quickly by the falling leaves accumulating under the tr

Mapping the Swaps Sorting an array can be done by swapping certain pairs of adjacent entries in the array. This is the fundamental technique used in the well-known bubble sort. If we l

The Settlers of Catan Within Settlers of Catan, the 1995 German game of the year, players attempt to dominate an island by building roads, settlements and cities across its uncharted w

Getting in Line Computer networking requires that the computers in the network be linked.This problem considers a ``linear" network in which the computers are chained together

The Broken Pedometer The ProblemA marathon runner uses a pedometer with which he is having problems. In the pedometer the symbols are represented by seven segments (or LEDs):But

ID Codes It is 2084 and the year of Big Brother has finally arrived, albeit a century late. In order to exercise greater control over its citizens and thereby to counter a chronic brea

The Hamming Distance Problem The Hamming distance between two strings of bits (binary integers) is the number of corresponding bit positions that differ. This can be found by using XOR

Decode the tapeTime Limit: 1 second"Machines take me by surprise with great frequency."Alan TuringYour boss has just unearthed a roll of old computer tapes. T

Problem B: Andy's First DictionaryTime limit: 3 secondsAndy, 8, has a dream - he wants to produce his very own dictionary. This is not an easy task for him, as the number of

Overflow Write a program that reads an expression consisting of two non-negative integer and an operator. Determine if either integer or the result of the expression is too large to be

Most crossword puzzle fans are used to anagrams--groups of words with the same letters in different orders--for example OPTS, SPOT, STOP, POTS and POST. Some words however do not have this attribute,

487-3279 Businesses like to have memorable telephone numbers. One way to make a telephone number memorable is to have it spell a memorable word or phrase. For example, you can call the

Power of Cryptography BackgroundCurrent work in cryptography involves (among other things) large prime numbers and computing powers of numbers modulo functions of these primes. W

Problem A.Ant on a Chessboard  Background  One day, an ant called Alice came to an M*M chessboard. She wanted to go around all the grids. So she began to walk along the chessboard ac

Cube painting We have a machine for painting cubes. It is supplied with three different colors: blue, red and green. Each face of the cube gets one of these colors. The cube's faces ar

When a number is expressed in decimal, the k-th digit represents a multiple of 10k. (Digits are numbered from right to left, where the least significant digit is number 0.) For example,When a

Multiplying by Rotation Warning: Not all numbers in this problem are decimal numbers!Multiplication of natural numbers in general is a cumbersome operation. In some cases how

Factoring Large NumbersOne of the central ideas behind much cryptography is that factoring large numbers is computationally intensive. In this context one might use a 100 digit number that was

Myacm TrianglesSource file:triangle.{c, cpp, java, pas}Input file:triangle.inOutput file:triangle.outThere has been considerable archeological work on the

#include#includeusing namespace std;#define N 25int num[N];int main(){ int n,lift,right; int i; while(cin>>n>>lift>>right,n||lift||right) { //Init. int cnt=n; int now_lift=1,now_righ