1 files changed, 15 insertions, 0 deletions
diff --git a/progs/a745.py b/progs/a745.py
new file mode 100644
index 0000000..9a21dfa
--- /dev/null
+++ b/progs/a745.py
@@ -0,0 +1,15 @@
+def find_rotation_count(A):
+    (left, right) = (0, len(A) - 1)
+    while left <= right:
+        if A[left] <= A[right]:
+            return left
+        mid = (left + right) // 2
+        next = (mid + 1) % len(A)
+        prev = (mid - 1 + len(A)) % len(A)
+        if A[mid] <= A[next] and A[mid] <= A[prev]:
+            return mid
+        elif A[mid] <= A[right]:
+            right = mid - 1
+        elif A[mid] >= A[left]:
+            left = mid + 1
+    return -1
+\ No newline at end of file