The following class is used to test board games. Many board games have a start and an end and some type of path or track you have to follow. In order to win the game, the players have to get from the start to the end and usually the faster the better. We will only be concerned with going from the start to the end. Speed is not important. class Board{ private boolean win; private char[][] board; public Board(int rows, int cols, String line){ //part a } //getStart returns a String storing the r and c of S in form "r c" public String getStart() { //code not shown } //getEnd returns a String storing the r and c of E in form "r c" public String getEnd() { //code not shown }private void check(int r, int c ) { //part b } public boolean win() { //part c } }Write the Board constructor method. The Board constructor will receive the number of rows, the number of columns, and the values to be placed in the board. line will store a series of characters. If the Board call new Board(3,3, "W-SE") was made, then the result would be a board of size 3 X 3 that looked as follows ::W - S- - -- - E W represents a wall, - represents a path, S represents the starting location, and E represents the exit. Write the Board constructor below. public Board(int rows, int cols, String line){ }

The three logical operators used to write compound conditions are "and," "or," and "not." a: true b: false

Consider a slotted aloha system, where the time slot equals the fixed duration of each packet. assume that there are 4 stations a,b,c,d sharing the medium. (a) stations a,b,c,d receive one packet each from higher layers at times 1.3, 1.5, 2.6,5.7 respectively. show which transmissions take place when, according to the slottedaloha protocol; describe all transmissions until all four packets have been successful.when needed, each station has access to the following sequence of random number, provided by a random number generator and drawn uniformly between 0 and 1: (1) station a draws numbers: 0.31, 0.27, 0.78, 0.9, 0.9, 0.11, 0. (2) station b draws numbers: 0.45, 0.28, 0.11, 0.83, 0.37, 0.22, 0. (3)station c draws numbers: 0.1, 0.2, 0.3, 0.4, 0. (4) station d draws numbers: 0.36, 0.77, 0.9, 0.1, 0.1, 0.1, 0.1, 0. (b) in slotted aloha, a station transmits in each time slot with a given probability. what probabilities would you assign to each of the four stations so as to: (i) maximize the efficiency of the protocol? (ii) maximize fairness among the four stations? (c) will the efficiency increase or decrease if we modify slotted aloha as follows: (i) get rid of slots and allow stations to transmit immediately? (ii) implement carrier sensing? (iii) implement collision detection? (iv) implement collision avoidance?

Write a function balancechemical to balance chemical reactions by solving a linear set of equations. the inputs arguments are: reagents: symbols of reagents in string row array products: symbols of products in string row array elements: elements in the reaction in string row array elcmpreag: elemental composition of reactants in two dimensional numeric array elcmpprdcts: elemental composition of prducts in two dimensional numeric array hint: the first part of the problem is setting up the set of linear equations that should be solve. the second part of the problem is to find the integers from the solution. one way to do this is to mulitiply the rational basis for the nullspace by increasing larger integers until both the left-and right-side integers exist. for example, for the reaction that involves reacting with to produce and : reagents=["ch4", "o2"]; products =["co2", "h2o"]; elements =["c","h", "o"] elcmpreag=[1,4,0;