Problem p02642 (python)

Fixed submission:
# Contest No.: ABC170
# Problem No.: D
# Solver:      JEMINI
# Date:        20200614

import sys
import heapq

def main():
    n = int(input())
    nums = list(map(int, sys.stdin.readline().split()))
    nums.sort()

    check = [False] * (10 ** 6 + 1)
    for i in range(1, n):
        if nums[i] == nums[i - 1]:
            check[nums[i]] = True
    #print(nums)
    ans = 0
    for i in range(n):
        if check[nums[i]] == False:
            ans += 1
        if i == 0 or (i > 0 and nums[i] != nums[i - 1]):
            cnt = nums[i] * 2
            while cnt < 10 ** 6 + 1:
                #print(cnt)
                check[cnt] = True
                cnt += nums[i]
        #print(ans)
    print(ans)

    
    return

if __name__ == "__main__":
    main()

Buggy submission (verdict: Runtime Error):
# Contest No.: ABC170
# Problem No.: D
# Solver:      JEMINI
# Date:        20200614


##### FAST INPUT #####
import os
import sys
from io import BytesIO, IOBase

BUFSIZE = 8192


class FastIO(IOBase):
    newlines = 0

    def __init__(self, file):
        self._fd = file.fileno()
        self.buffer = BytesIO()
        self.writable = "x" in file.mode or "r" not in file.mode
        self.write = self.buffer.write if self.writable else None

    def read(self):
        while True:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            if not b:
                break
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines = 0
        return self.buffer.read()

    def readline(self):
        while self.newlines == 0:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            self.newlines = b.count(b"\n") + (not b)
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines -= 1
        return self.buffer.readline()

    def flush(self):
        if self.writable:
            os.write(self._fd, self.buffer.getvalue())
            self.buffer.truncate(0), self.buffer.seek(0)


class IOWrapper(IOBase):
    def __init__(self, file):
        self.buffer = FastIO(file)
        self.flush = self.buffer.flush
        self.writable = self.buffer.writable
        self.write = lambda s: self.buffer.write(s.encode("ascii"))
        self.read = lambda: self.buffer.read().decode("ascii")
        self.readline = lambda: self.buffer.readline().decode("ascii")


sys.stdin, sys.stdout = IOWrapper(sys.stdin), IOWrapper(sys.stdout)
input = lambda: sys.stdin.readline().rstrip("\r\n")
##### END OF FAST INPUT #####
#import sys
import heapq

def main():
    n = int(input())
    nums = list(map(int, input().split()))
    if n == 1:
        print(1)
        return
    nums = list(set(nums))
    nums.sort()
    if len(nums) == 1:
        print(0)
        return
    if nums[0] == 1:
        print(1)
        return
    
    #nums = list(reversed(nums))
    checkList = [True] * n
    i = 0
    while i < n - 1:
        if not checkList[i]:
            i += 1
            continue
        j = i + 1
        
        pFront = j
        pRear = n - 1

        while True:
            pMid = (pFront + pRear) // 2
            if nums[pFront] * 2 >= nums[i]:
                j = pFront
                break
            if nums[pRear] * 2 < nums[i]:
                j = pRear
                break
            if nums[pMid] * 2 >= nums[i]:
                pRear = pMid - 1
            else:
                pFront = pMid + 1

        while j < n:
            if nums[j] % nums[i] == 0:
                checkList[j] = False
            j += 1
        i += 1
        #print(nums)
        #print(checkList)
    print(sum(checkList))


    
    return

if __name__ == "__main__":
    main()