ENG  RUS Timus Online Judge
Online Judge
Problems
Authors
Online contests
About Online Judge
Frequently asked questions
Site news
Webboard
Links
Problem set
Submit solution
Judge status
Guide
Register
Update your info
Authors ranklist
Current contest
Scheduled contests
Past contests
Rules
back to board

Discussion of Problem 1880. Psych Up's Eigenvalues

Python Solution.
Posted by Vladislav Ershov 19 Jul 2019 19:53
Python Solution.
Posted by Vladislav Ershov 19 Jul 2019 19:55
def bin_Search(arr, val):
low = 0
high = len(arr)-1
while low <= high:
mid = (low + high) // 2
if val < arr[mid]:
high = mid - 1
elif val > arr[mid]:
low = mid + 1
else:
return True
else:
return False

aa = int(input())
aArr = list(map(int, input().split()))
b = int(input())
bArr = list(map(int, input().split()))
c = int(input())
cArr = list(map(int, input().split()))

aArr.sort()
bArr.sort()
cArr.sort()
cnt = 0

for i in aArr:
s = bin_Search(bArr, i)
if s == True:
s1 = bin_Search(cArr, i)
if s1 == True:
cnt += 1

print(cnt)

Here i use binary search