Swapping Pairs Make Sum Equal || Program 56 || Competitive Coding || Learning Monkey ||
Swapping Pairs Make Sum Equal
In this class, We discuss Swapping Pairs Make Sum Equal.
Readers can prepare an entire competitive coding course to crack product development companies. Click Here.
The reader should have basic coding skills to work with competitive coding. Click here.
Question:
Given two arrays of size N and M.
Our task is to find a pair of elements from each array.
Swapping the elements makes the sum of elements in both arrays is same.
Example:
N = 6, M = 4
A = [4, 1, 2, 1, 1, 2]
B = [3, 6, 3, 3]
Output = 1
Swap elements one from A and three from B.
After swapping, the sum of elements is the same in both arrays.
There is a possibility to swap, so output 1.
If there is no such possibility, Then output -1.
Logic:
Two ways we can solve this example.
1) Using sorting
2) Using Heap
Both ways are important to understand.
The step-by-step explanation is provided in the video.
Code:
class Solution:
def findSwapValues(self,a, n, b, m):
sum1,sum2=0,0
for i in range(n):
sum1+=a[i]
for j in range(m):
sum2+=b[j]
a.sort()
b.sort()
i,j=0,0
while(iltn and jltm):
val=sum1-(a[i])+(b[j])
val2=sum2+(a[i])-(b[j])
if val==val2:
return 1
if(valgtval2):
i+=1
else:
j+=1
return -1
a=[4, 1, 2, 1, 1, 2]
b = [3, 6, 3, 3]
ob=Solution()
z=ob.findSwapValues(a,6,b,4)
print(z)
class Solution:
def findSwapValues(self,a, n, b, m):
x, y = {}, {}
s1, s2 = 0, 0
for i in range(n):
s1 += a[i]
x[a[i]] = x.get(a[i], 0) + 1
for i in range(m):
s2 += b[i]
y[b[i]] = y.get(b[i], 0) + 1
if (s1 - s2) % 2:
return -1
for p in x:
q = ((s2 - s1)//2) + p
if q in y:
return 1
return -1
a=[4, 1, 2, 1, 1, 2]
b = [3, 6, 3, 3]
ob=Solution()
z=ob.findSwapValues(a,6,b,4)
print(z)
Link for playlists:
/ @learningmonkey
Link for our website: https://learningmonkey.in
Follow us on Facebook @ / learningmonkey
Follow us on Instagram @ / learningmonkey1
Follow us on Twitter @ / _learningmonkey
Mail us @ [email protected]
Nesta página do site você pode assistir ao vídeo on-line Swapping Pairs Make Sum Equal || Program 56 || Competitive Coding || Learning Monkey || duração hora minuto segundo em boa qualidade , que foi baixado pelo usuário Learning Monkey 24 Maio 2023, compartilhe o link com seus amigos e conhecidos, no youtube este vídeo já foi visto 716 vezes e gostou 11 espectadores. Boa visualização!
