Syntax error Check if it is possible to transform one string to another in Python

Check if it is possible to transform one string to another in Python

Suppose we have two strings s and t, t is in uppercase. We have to check whether we can convert s to t by performing following operations.

  • Convert some lowercase letters uppercase.
  • Remove all of the lowercase letters.

So, if the input is like s = "fanToM", t = "TOM", then the output will be True as we can change ‘o’ to ‘O’ then remove all other lowercase letters from s to make it t.

To solve this, we will follow these steps −

  • n := size of s, m := size of t
  • dp:= a matrix of size (m + 1)x(n + 1) and fill with False
  • dp[0, 0] := True
  • for i in range 0 to size of s - 1, do
    • for j in range 0 to size of t, do
      • if dp[i, j] is True, then
        • if j < size of t and s[i] in uppercase is same as t[j], then
          • dp[i + 1, j + 1] := True
        • if s[i] is not in uppercase, then
          • dp[i + 1, j] := True
  • return dp[n, m]

Example

Let us see the following implementation to get better understanding −

 Live Demo

def solve(s,t):
   n = len(s)
   m = len(t)
   dp= [[False for i in range(m+1)] for i in range(n+1)]
   dp[0][0] = True
   for i in range(len(s)):
      for j in range(len(t)+1):
         if dp[i][j] == True:
            if j < len(t) and (s[i].upper() == t[j]):
               dp[i + 1][j + 1] = True
            if s[i].isupper()==False:
               dp[i + 1][j] = True
   return dp[n][m]
s = "fanToM"
t = "TOM"
print(solve(s, t))

Input

"fanToM", "TOM"

Output

True
Updated on: 2021-01-19T04:37:38+05:30

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