{
    "q1": {
        "type": "multiple", 
        "question": "\n<strong>\n\nIn regards to greedy algorithms, which of the following statements are true\n(select all that apply)?\n\n</strong>\n", 
        "responses": {
            "efficiency": "A greedy algorithm tends to be very efficient.", 
            "backtrack": "A greedy algorithm will backtrack when it finds a suboptimal solution.", 
            "approach": "A greedy algorithm constructs a solution by choosing the best option at the moment.", 
            "guarantee": "A greedy algorithm is guaranteed to find the optimal solution."
        }
    }, 
    "q3": {
        "type": "multiple", 
        "question": "\n<strong>\n\nIn regards to data compression, which of the following statements are true\n(select all that apply)?\n\n</strong>\n", 
        "responses": {
            "variable": "Variable-length codes are suboptimal because they utilize longer codewords.", 
            "prefix": "Codewords can have the same prefix if they are variable length.", 
            "compress": "To compress a string, we use binary code to replace each character with a corresponding codeword.", 
            "codeword": "In a constant-length code, the length of each binary code is the same."
        }
    }, 
    "q2": {
        "type": "single", 
        "question": "\n<strong>\n\nGiven n events with their starting and ending times, which of the following\ngreedy strategies is considered optimal?\n\n</strong>\n", 
        "responses": {
            "osclass": "I am not in operating systems.", 
            "begin": "Always choose the event with the earliest start time first.", 
            "end": "Always choose the event with the earliest end time first.", 
            "shortest": "Always choose the event with the shortest time first."
        }
    }, 
    "q4": {
        "type": "multiple", 
        "question": "\n<strong>\nGiven the string <tt>DACABAD</tt> which of the following are valid Huffman\ncodes (select all that apply)?\n</strong>\n", 
        "responses": {
            "a": "<tt>A = 1, B = 001, C = 000, D = 01</tt>", 
            "c": "<tt>A = 1, B = 000, C = 001, D = 01</tt>", 
            "b": "<tt>A = 0, B = 110, C = 111, D = 10</tt>", 
            "e": "<tt>A = 1, B = 111, C = 110, D = 10</tt>", 
            "d": "<tt>A = 0, B = 010, C = 111, D = 10</tt>"
        }
    }
}