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Puzzles Interview Question:
Substitute digits for the letters to make the following relation true.
S T I L L
+ W I T H I N
--------------------
L I M I T S
Note that the leftmost letter cant be zero in any word. Also, there must be a one-to-one mapping between digits and letters. e.g. if you substitute 3 for the letter S, no other letter can be 3 and all other S in the puzzle must be 3?
Submitted by: AdministratorThe value of L must be one more than W i.e. L=W+1 and there must be one carry from S+I=I. Also, the value of S must be 9 as S+I=I with one carry from T+T=M, which means that the value of T must be greater than 4.
From I+H=I, the value of H must be 0 as the value of S is 9.
Now, applying all those constraints and using trial-n-error, we get two possible answers.
9 7 1 6 6 9 8 5 3 3
+ 5 1 7 0 1 3 + 2 5 8 0 5 6
--------------- ---------------
6 1 4 1 7 9 3 5 6 5 8 9
The second answer
258056
+98533
---------
356589
is wrong as the value of both N and M is 6 here.
I have tried all the combinations and there seems to be only one solution i.e. the first one
517013
+ 97166
----------
614179
The other constraints that i have found while solving the question are :
L cant be 1
N cant be 8
H = 0
T can have only values 6/7/8
and corresponding M is 2/4/6
Submitted by: Administrator
From I+H=I, the value of H must be 0 as the value of S is 9.
Now, applying all those constraints and using trial-n-error, we get two possible answers.
9 7 1 6 6 9 8 5 3 3
+ 5 1 7 0 1 3 + 2 5 8 0 5 6
--------------- ---------------
6 1 4 1 7 9 3 5 6 5 8 9
The second answer
258056
+98533
---------
356589
is wrong as the value of both N and M is 6 here.
I have tried all the combinations and there seems to be only one solution i.e. the first one
517013
+ 97166
----------
614179
The other constraints that i have found while solving the question are :
L cant be 1
N cant be 8
H = 0
T can have only values 6/7/8
and corresponding M is 2/4/6
Submitted by: Administrator
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