Closed RahZero0 closed 4 days ago
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LeetCode Username
WwRXCklvRa
Problem Number, Title, and Link
Bug Category
Missing test case (Incorrect/Inefficient Code getting accepted because of missing test cases)
Bug Description
Bug Type: Logical error leading to incorrect swap detection.
Bug Summary: The function incorrectly tracks mismatched indices when the first character of s1 and s2 differ. This happens because index1 and index2 are initialized to 0, which is a valid index in the string. As a result, the first mismatch at index 0 is not properly recorded, causing incorrect swap validation.
Issue Details: Incorrect Index Tracking:
index1 and index2 are initialized to 0. If the first character itself is a mismatch (s1[0] != s2[0]), index1 remains 0, causing the actual first mismatch to be ignored. When a second mismatch occurs, index2 is also assigned 0, overwriting the actual second mismatch index. False Positive Swap Detection:
Due to the incorrect index tracking, the function might mistakenly believe a valid swap exists even when multiple swaps are required. This results in the function returning true when it should return false.
Language Used for Code
Java
Code used for Submit/Run operation
Expected behavior
The function
areAlmostEqual(s1, s2)
should returntrue
only ifs2
can be obtained froms1
by swapping exactly one pair of characters. Otherwise, it should returnfalse
.Expected Conditions for
true
:s1
ands2
must have exactly two mismatched characters.s1
must make it equal tos2
.s1
ands2
are already identical, returntrue
(since no swap is needed).Expected Conditions for
false
:s1
ands2
have more than two mismatched characters.s1
equal tos2
.s1
ands2
have different lengths.Test Cases & Expected Output:
Behavior of Function for s1 = "bankb", s2 = "kanbk"
Input:
s1: "bankb"
s2: "kanbk"
Step-by-Step Execution:
Mismatch Condition Check:
More than two mismatches found at indices 0, 3, and 4.
The function should return false because a single swap cannot fix the issue.
Expected Output:
false
Behavior of Function for s1 = "appla", s2 = "lppal"
Input:
s1: "appla"
s2: "lppal"
Step-by-Step Execution:
Mismatch Condition Check:
More than two mismatches found at indices 0, 3, and 4.
The function should return false because a single swap cannot fix the issue.
Expected Output:
false
Why This Test Cases are Important:
Screenshots
Additional context
No response