# Python program for implementation of Radix Sort
	
# A function to do counting sort of arr[] according to
# the digit represented by exp.
def countingSort(arr, exp1):
	
	n = len(arr)
	
	# The output array elements that will have sorted arr
	output = [0] * (n)
	
	# initialize count array as 0
	count = [0] * (10)
	
	# Store count of occurrences in count[]
	for i in range(0, n):
		index = (arr[i]/exp1)
		count[int((index)%10)] += 1
	
	# Change count[i] so that count[i] now contains actual
	# position of this digit in output array
	for i in range(1,10):
		count[i] += count[i-1]
	
	# Build the output array
	i = n-1
	while i>=0:
		index = (arr[i]/exp1)
		output[ count[ int((index)%10) ] - 1] = arr[i]
		count[int((index)%10)] -= 1
		i -= 1
	
	# Copying the output array to arr[],
	# so that arr now contains sorted numbers
	i = 0
	for i in range(0,len(arr)):
		arr[i] = output[i]

# Method to do Radix Sort
def radixSort(arr):

	# Find the maximum number to know number of digits
	max1 = max(arr)

	# Do counting sort for every digit. Note that instead
	# of passing digit number, exp is passed. exp is 10^i
	# where i is current digit number
	exp = 1
	while max1/exp > 0:
		countingSort(arr,exp)
		exp *= 10

# Driver code to test above
arr = [ 170, 45, 75, 90, 802, 24, 2, 66]
radixSort(arr)

for i in range(len(arr)):
	print(arr[i]),

import subprocess   #for the praat calls
import os   #for ffmpeg and the pause call at the end
#Even if we wanted all videos being rendered asynchronously, we couldn't see progress or errors
import glob #for the ambiguous files
import tempfile
audioFileDirectory = 'Audio Files'
timeList = {}
fileList = glob.glob(audioFileDirectory + '\\*.wav')
pipeList = {}
for fileName in fileList:
    arglist = ['Praat.exe', '--run', 'crosscorrelateMatch.praat', 'zeussound.wav', fileName, "0" , "300"]
    print(' '.join(arglist))
    pipe = subprocess.Popen(arglist, stdout=subprocess.PIPE)
    pipeList[fileName[len(audioFileDirectory)+1:-4]] = pipe #+1 because of back slash, -4 because .wav
#for fileName, pipe in pipeList.items():
#    text = pipe.communicate()[0].decode('utf-8')
#    timeList[fileName] = float(text[::2])
for fileName, pipe in pipeList.items():
    if float(pipe.communicate()[0].decode('utf-8')[::2]) > .0003:    #.000166 is not a match, and .00073 is a perfect match. .00053 is a tested match
        arglist = ['Praat.exe', '--run', 'crosscorrelate.praat', 'zeussound.wav', audioFileDirectory + '\\' + fileName + '.wav', "0" , "300"]
        print(' '.join(arglist))
        text = subprocess.Popen(arglist, stdout=subprocess.PIPE).communicate()[0].decode('utf-8')
        timeList[fileName] = float(text[::2])
clipLength = 10
for fileName, time in timeList.items():
    arglist = ['ffmpeg', '-i', '"'+fileName+'.mp4"', '-ss', str(time-clipLength), '-t', str(clipLength*2), '-acodec', 'copy' , '-vcodec', 'copy', '"ZEUS'+ fileName + '.mp4"']
    print(' '.join(arglist))
    os.system(' '.join(arglist))
tempFile = tempfile.NamedTemporaryFile(delete=False)
for fileName in glob.glob('ZEUS*.mp4'):
    tempFile.write(("file '" + os.path.realpath(fileName) + "'\n").encode());
tempFile.seek(0)
print(tempFile.read())
tempFile.close()
arglist = ['ffmpeg', '-safe', '0', '-f', 'concat', '-i', '"'+tempFile.name+'"', '-c', 'copy', 'ZeusMontage.mp4']
print(' '.join(arglist))
os.system(' '.join(arglist))
os.unlink(tempFile.name)    #Delete the temp file
#print(timeList)
os.system('PAUSE')

#84 48 13 20 61 20 33 97 34 45 6 63 71 66 24 57 92 74 6 25 51 86 48 15 64 55 77 30 56 53 37 99 9 59 57 61 30 97 50 63 59 62 39 32 34 4 96 51 8 86 10 62 16 55 81 88 71 25 27 78 79 88 92 50 16 8 67 82 67 37 84 3 33 4 78 98 39 64 98 94 24 82 45 3 53 74 96 9 10 94 13 79 15 27 56 66 32 81 77
# xor a list of integers to find the lonely integer
res = a[0]
    for i in range(1,len(a)):
        res = res ^ a[i]

import os, json, boto3, requests
from flask import Flask, request, jsonify
from flask_cors import CORS, cross_origin
from random import shuffle

app = Flask(__name__)
cors = CORS(app)

dynamodb = boto3.resource("dynamodb", region_name="us-east-1")

app.url_map.strict_slashes = False
SECRET_KEY = os.environ.get("SECRET_KEY")


@app.route("/teks")
def teks_request():
    teks_file = open("teks.json", "r")
    data = json.load(teks_file)
    return jsonify(data)


@app.route("/teks/find/113.41.<int:teks_id>.<string:section_id>")
def teks_find_request(teks_id, section_id):
    teks_file = open("teks.json", "r")
    data = json.load(teks_file)
    for item in data:
        if item["id"] == teks_id:
            for child in item["children"]:
                if child["id"] == section_id:
                    return {"tek": item, "content": child["content"]}
    return jsonify(
        [
            f"Something went wrong. TEKS section id of {section_id} cannot be found within TEKS section {teks_id}."
        ]
    )

@app.route("/lessonplan/read/<id>")
def read_lesson_plan(id):
    lesson_table = dynamodb.Table("Lesson_Plans")
    items = lesson_table.scan()['Items']
    for lesson in items:
        if (lesson["uuid"] == id):
            return jsonify(lesson)
    return {"error": "id does not exist", "section": id}

@app.route("/teks/<int:teks_id>")
def teks_id_request(teks_id):
    teks_file = open("teks.json", "r")
    data = json.load(teks_file)
    for item in data:
        if item["id"] == teks_id:
            return jsonify(item)
    return jsonify([f"Something went wrong. TEKS id of {teks_id} cannot be found."])


@app.route("/assessment/write", methods=["GET", "POST"])
def assessment_write():
    assessment_json = request.json
    assessment_data = dict(assessment_json)
    assessment_table = dynamodb.Table("Assessments")
    assessment_table.put_item(Item=assessment_data)

    if assessment_data == get_assessment(assessment_data["id"]):
        return "Success"
    else:
        return "Failure"

@app.route("/students/read/<id>")
def students_read(id):
    return jsonify(get_students(id))

@app.route("/students/read")
def all_students_read():
    student_table = dynamodb.Table("Students") 
    items = student_table.scan()['Items']
    return jsonify(items)

@app.route("/assessment/read/<id>")
def assessment_read(id):
    return jsonify(get_assessment(id))


@app.route("/assessment/submit/<id>", methods=["POST"])
def submit_assessment(id):
    assessments_table = dynamodb.Table("Assessments")
    assessment = assessments_table.get_item(Key={"id": id})

    if not assessment.get("Item"):
        return {"error": "id does not exist", "section": id}

    responses = {
        question["id"]: question["response"]
        for question in request.json.get("questions")
    }

    correct_answers = 0

    for response in responses:
        # print(
        #     (
        #         responses[response],
        #         find_question(assessment.get("Item").get("questions"), response).get(
        #             "correctAnswer"
        #         ),
        #     )
        # )
        if responses[response] == find_question(
            assessment.get("Item").get("questions"), response
        ).get("correctAnswer"):

            correct_answers += 1

    score = correct_answers / len(request.json.get("questions"))

    users_table = dynamodb.Table("Students")

    users_table.update_item(
        Key={"uuid": request.json.get("student_id")},
        UpdateExpression="SET completedAssessments = list_append(completedAssessments, :i)",
        ExpressionAttributeValues={
            ":i": [
                {
                    "id": id,
                    "score": round(score * 100),
                }
            ]
        },
    )

    message = None
    if round(score * 100) > 70:
        message = f"Congratulations! You passed your assessment with a {round(score * 100)}%."
    else:
        message = f"You failed your assessment with a {round(score * 100)}%."

    sns = boto3.client("sns", region_name="us-east-1")
    number = "+15125967383"
    sns.publish(PhoneNumber=number, Message=message)

    return {"score": score, "message": message}


def find_question(all, id):
    #print("id to find: ", id)
    for question in all:
        if question["id"] == id:
            #print(question)
            return question


def get_assessment(id):
    assessment_table = dynamodb.Table("Assessments")
    results = assessment_table.get_item(Key={"id": id})

    if results.get("Item") is None:
        return {"error": "id does not exist", "section": id}
    else:
        quiz = results.get("Item")
        return {
            "title": quiz.get("title"),
            "id": quiz.get("id"),
            "questions": [
                {
                    "id": question.get("id"),
                    "title": question.get("title"),
                    "options": random_answers(
                        question.get("incorrectAnswers")
                        + [question.get("correctAnswer")]
                    ),
                }
                for question in quiz.get("questions")
            ],
        }

def get_students(id):
    students_table = dynamodb.Table('Students')
    results = students_table.get_item(Key = {
        "uuid": id
    })

    if(results.get("Item") is None):
        return {'error': 'id does not exist', 'section': id}
    else:
        student = results.get("Item")
        return student

def lesson_plans_read():
    student_table = dynamodb.Table("Lesson_Plans")
    items = student_table.scan()['Items']
    return jsonify(items)

def random_answers(answers):
    shuffle(answers)
    return answers

@app.route("/recommendations/<uuid>")
def get_recommendation(uuid):
    student_info_table = dynamodb.Table('Students')
    lesson_plans_table = dynamodb.Table('Lesson_Plans')
    student = get_students(uuid)
    tek = student.get("struggleTeks")[0]

    lesson_plans = lesson_plans_table.scan( Select='ALL_ATTRIBUTES', FilterExpression='tek = :s', ExpressionAttributeValues={ ":s": tek })

    #print(lesson_plans) 

    return jsonify({"student": student, "lesson_plans": lesson_plans.get("Items")})

if __name__ == "__main__":
    app.run(host="0.0.0.0", debug=True)

from statistics import median, mean, mode

def print_stats(array):
  print(array)
  print("median =", median(array))
  print("mean   =", mean(array))
  print("mode   =", mode(array))
  print()

print_stats([1, 2, 3, 3, 4])
print_stats([1, 2, 3, 3])

#You are given a two-digit integer n. Return the sum of its digits.
#Example
#For n = 29 the output should be solution (n) = 11
def solution(n):
    return (n//10 + n%10)