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Program to find minimum possible integer after at most k adjacent swaps on digits in Python
Suppose we have a string called num representing a very large integer number and also have another value k. We can swap any two adjacent digits of the values at most k times. We have to find the minimum value we can get.
So, if the input is like num = "5432" k = 4, then the output will be 2453 because at first number is 5432. Then after first phase it will be 4532, then 4523, then 4253 and at final phase 2453.
To solve this, we will follow these steps
min_num := sort the digits of num
i := 0, to_find := 0
while num is not same as min_num and k > 0 and i < size of num, do
indx := index of item to_find from index i in num
while indx is not same as -1, do
if indx - i <= k, then
num := num[from index 0 to i-1] concatenate num[indx] concatenate num[from index i to indx-1] concatenate num[from index indx+1 to end]
k := k -(indx - i)
i := i + 1
to_find := 0
indx := index of item to_find from index i in num
otherwise,
come out from loop
to_find := to_find + 1
return num
Example
Let us see the following implementation to get better understanding
def solve(num, k):
min_num = sorted(list(num))
min_num = ''.join(min_num)
i = 0
to_find = 0
while num != min_num and k > 0 and i < len(num):
indx = num.find(str(to_find), i)
while indx != -1:
if indx - i <= k:
num = num[:i] + num[indx] + num[i:indx] + num[indx+1:]
k -= (indx - i)
i += 1
to_find = 0
indx = num.find(str(to_find), i)
else:
break
to_find += 1
return num
num = "5432"
k = 4
print(solve(num, k))Input
"5432", 4
Output
2453
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