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Create sentinel_search.py #907

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19 changes: 19 additions & 0 deletions algorithms/search/sentinel_search.py
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Original file line number Diff line number Diff line change
@@ -0,0 +1,19 @@
def SentinelSearch(arr, len, target):

# Get last element of the array
lastEle = arr[len - 1]

# Element to be searched is placed at the last index known as "Sentinel"
arr[len - 1] = target
i = 0
# Traverse through array
while (arr[i] != target):
i += 1

# Put the last element back
arr[len - 1] = lastEle

if ((i < len - 1) or (arr[len - 1] == target)):
return i
else:
return -1