Given an array of integers in which the difference between two adjacent integers is less than or equal to 1. Find the first occurrence of an given integer. Do better than linear search.

int firstOccurence(vector < int > A, int n)

{

int i = 0;

int size = A.size();

while(i < size)

{

if(A[i] == n)

return i;

i += abs(n - A[i]);

}

return -1;

}

int firstOccurence(vector < int > A, int n)

{

int i = 0;

int size = A.size();

while(i < size)

{

if(A[i] == n)

return i;

i += abs(n - A[i]);

}

return -1;

}

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