Enter a string (str):
Enter an integer (n):
Result:
SUB FIRST
List of Executions:String str Index n Result
Assume users fill a string for the "str" textfield and an integer for the "n" textfield (0 < n < length of string str), when users click "SUB FIRST" button:
a. Check exist: If list of execution exists an item containing the textfields "str" and "n", show the error text "Execution existed!". (1.0 point)
When innut string str and integer n
After clicking the "SUB FIRST" button
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