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Programs executed concurrently on a uniprocessor system appear to be executed at the same time, but in reality the single CPU alternates between the programs, executing some number of instructions from each program before switching to the next. You are to simulate the concurrent execution of up to ten programs on such a system and determine the output that they will produce.
The program that is currently being executed is said to be running, while all programs awaiting execution are said to be ready. A program consists of a sequence of no more than 200 statements, one per line, followed by an
The first line of the input file consists of seven integers separated by spaces. These integers specify (in order): the number of programs which follow, the unit execution times for each of the five statements (in the order given above), and the number of time units comprising the time quantum. The remainder of the input consists of the programs, which are correctly formed from statements according to the rules described above.
All program statements begin in the first column of a line. Blanks appearing in a statement should be ignored. Associated with each program is an identification number based upon its location in the input data (the first program has ID=1, the second has ID=2, etc.).
Your output will contain the output generated by the print statements as they occur during the simulation. When a print statement is executed, your program should display the program ID, a colon, a space, and the value of the selected variable. Output from separate print statements should appear on separate lines. A sample input and correct output is shown below.
3 1 1 1 1 1 1 a = 4 print a lock b = 9 print b unlock print b end a = 3 print a lock b = 8 print b unlock print b end b = 5 a = 17 print a print b lock b = 21 print b unlock print b end
1: 3 2: 3 3: 17 3: 9 1: 9 1: 9 2: 8 2: 8 3: 21 3: 21