# Sample_exam2 - COP 3502 Computer Science I Exam#2(Monday...

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COP 3502 – Computer Science I Exam #2 – 7/7/08 (Monday) Name : ______________________________ 1) (5 pts) An O(n 2 ) algorithm takes 2 ms. to run on an input size of n = 50. On another input size, the algorithm took 72 ms. to run, what was that input size? 2) (8 pts) Determine the following sum in terms of n: + = - 3 15 5 2 n i i . 3) (5 pts) What is the run-time (order) of the following code segment in terms of n? for (i=0; i<n; i++) { for (j=0; j<i; i++) { sum += j; } }

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4) (5 pts) What is the run-time (order) of the following code segment in terms of n? i=0, j=0; while (i < n && j < n) { while (j < n && A[i][j] == 1) j++; i++; } 5) (5 pts) What is the run-time (order) of the following code segment in terms of n? i=0, j=0; while (i < n && j < n) { j=0; while (j < n && A[i][j] == 1) j++; i++; }
6) (7 pts) Evaluate the following postfix expression and show the state of the operand stack at the indicated points: a b c 3 5 7 + 8 4 / / 3 5 + * Final Value : _____________ 7) (10 pts) Convert the following infix expression to postfix and show the state of the operator stack at the indicated points.

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