Automated grading of homework assignments and tests
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The string variable s is given. return the first character.
Example 1:
Input: a="python"
Output: "p"Example 2:
Input: a="code"
Output: "c"Constraints:
- 2 <= length(a) <= 10^5
The string variable s is given. return the second character.
Example 1:
Input: a="python"
Output: "y"Example 2:
Input: a="code"
Output: "y"Constraints:
- 2 <= length(a) <= 10^5
The string variable s is given. return the last character.
Example 1:
Input: a="number"
Output: "r"Example 2:
Input: a="code"
Output: "e"Constraints:
- 2 <= length(a) <= 10^5
The s string variable is given. Return three characters from the beginning.
Example 1:
Input: a="number"
Output: "num"Example 2:
Input: a="codeschool"
Output: "cod"Constraints:
- 4 <= length(a) <= 10^5
Given a variable s string of length five. Determine the number of digits involved in this variable.
Example 1:
Input: a="32x3z"
Output: 3Example 2:
Input: a="12340"
Output: 5Constraints:
- length(a) == 5
A string variable consisting of several characters is given. Add and return the first and last character.
Example 1:
Input: a="uz"
Output: "uz"Example 2:
Input: a="good"
Output: "gd"Constraints:
- 2 <= length(a) <= 10^5
The s string variable is given. n Return the character in the index, otherwise return False.
Example 1:
Input: a="uz" n=4
Output: FalseExample 2:
Input: a="good" n=3
Output: "d"Constraints:
- 2 <= length(a) <= 10^5
A string of length five is given. Return the index of the "*" character, return False if not present.
Example 1:
Input: a="2*44"
Output: 1Example 2:
Input: a="good"
Output: FalseConstraints:
- 2 <= length(a) <= 10^5
a single character string is given. Convert it to int type, return -1 if not possible.
Example 1:
Input: a="4"
Output: 4Example 2:
Input: a="k"
Output: -1Constraints:
- length(a) == 1
A string of five numbers is given. Find the sum of its numbers.
Example 1:
Input: a="12332"
Output: 11Example 2:
Input: a="10002"
Output: 3Constraints:
- length(a) == 5
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