upload

1/I.py

@@ -0,0 +1,76 @@
+def solution(start, stop, debug=False):
+    one = 0
+    zero = 0
+    length = len(bin(start)) - 2
+
+    if len(bin(stop)) - 2 == 1 or len(bin(stop)) - 2 == 2:
+        return 0
+
+    for i in bin(start)[2:]:
+        if i == '1' and zero == 0:
+            one += 1
+        elif i == '0':
+            zero += 1
+        else:
+            break
+
+    # first iteration
+    number = '1' * one + '0' * zero + '1' * (length - one - zero)
+    counter = 0
+    if int(number, 2) == stop:
+        return 1
+    elif int(number, 2) < stop:
+        if len(number) > 3:
+            counter += 1
+            if debug:
+                print(number, int(number, 2))
+    else:
+        return 0
+
+    while int(number, 2) < stop:
+        zero -= 1
+        if zero == 0:
+            one += 1
+            zero = length - one - 1
+        if one >= length - 1:
+            length += 1
+            one = 1
+            zero = length - one - 1
+        number = '1' * one + '0' * zero + '1' * (length - one - zero)
+        if len(number) < 3:
+            continue
+
+        if number.split('0')[0] != number:
+            if debug:
+                print(number, int(number, 2))
+            counter += 1
+
+    if int(number, 2) > stop:
+        counter -= 1
+
+    return counter
+
+
+def test():
+    input_data: list[tuple[int, int]] = [
+        # (259, 263),
+        # (259, 264),
+        # (16384, 65536),
+        # (16385, 16385),
+        # (16385, 16386),
+        # (259, 16387),
+        (1, 10000000000)
+        # (1, 16)
+    ]
+
+    for data in input_data:
+        print(solution(*data, debug=True))
+
+
+def main():
+    start, stop = map(int, input().split())
+    print(solution(start, stop))
+
+
+test()
+