upd

algorithms/labs/lab8/code/search/3.py

@@ -0,0 +1,31 @@
+def search_matrix(matrix, target):
+    if not matrix or not matrix[0]:
+        return False
+    top, bot = 0, len(matrix) - 1
+    while top <= bot:
+        mid = (top + bot) // 2
+        if matrix[mid][0] <= target <= matrix[mid][-1]:
+            row = mid
+            break
+        if target < matrix[mid][0]:
+            bot = mid - 1
+        else:
+            top = mid + 1
+    else:
+        return False
+    l, r = 0, len(matrix[row]) - 1
+    while l <= r:
+        m = (l + r) // 2
+        if matrix[row][m] == target:
+            return True
+        if matrix[row][m] < target:
+            l = m + 1
+        else:
+            r = m - 1
+    return False
+
+
+if __name__ == "__main__":
+    matrix = [[1, 3, 5, 7], [10, 11, 16, 20], [23, 30, 34, 60]]
+    print(search_matrix(matrix, 3))
+    print(search_matrix(matrix, 13))