Most Frequent Number Following Key In an Array


In this code:
cnt
is initialized as a list of zeros with a length of 1001, which corresponds to the integer array in the C++ code.res
corresponds to the result variable in the C++ code and is initialized as 0. The for loop iterates from 1 to the length of
nums
, corresponding to the C++ code.  If the previous element of
nums
is equal to the key, the count of the current element incnt
is incremented.  If the incremented count is larger than the count of the current result, the result is updated to the current number. This corresponds to the condition inside the if statement in the C++ code.
 The result is then returned.
Q&A
Kindly help with my code….idk where it’s going wrong


The original code tries to find the most frequent number that follows the key
number in the nums
array. However, it seems to have a logical error. Once the key
is found in the array, the code checks the next number (if it exists), but the subsequent loop does not seem to be working as intended.
In your code, you are incrementing the count cnt
when you find a number that equals nums[idx]
but this logic will not work correctly. The variable idx
was only set at the beginning and it does not update after the first iteration. Therefore, you are not correctly counting the occurrences of the number that follows key
in the nums
array.
Also, you are decrementing the count cnt
when you find a number that is not equal to nums[idx]
and resetting the idx
when the count cnt
reaches zero. This is not correct because you are trying to count the number that occurs most frequently after key
, not just the subsequent number.
Here is a corrected version of your code:


In this version of the function, an unordered_map count
is used to keep track of the count of each number that follows key
in the nums
array. The maxCount
variable is used to store the maximum count encountered so far, and res
stores the number that has the maximum count. The for
loop iterates over the nums
array, and if the current number equals key
, it increments the count of the next number in the count
map. If this new count is greater than the maxCount
, maxCount
and res
are updated. At the end of the function, res
is returned, which is the most frequently occurring number after key
in the nums
array.