diff --git a/hard/day_20/problem.txt b/hard/day_20/problem.txt
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+Once Bluemin decided to adorn his living room with a tessellated floor. 
+The living room boasts dimensions  n x m  meters. 
+Bluemin had at his disposal planks of three varieties:  
+-a  planks measuring  1 x 2  meters,  
+-b  planks measuring  2 x 1  meters, 
+-c  planks measuring  2 x 2  meters. 
+
+Your task is to aid Bluemin in determining whether it's feasible to embellish the living room with such a collection of planks. If possible, you should provide one potential arrangement.
+
+Input:
+The initial line presents 5 space-separated integers:  n ,  m ,  a ,  b , and  c  ( 1 ≤ n, m ≤ 100 ,  0 ≤ a, b, c ≤ 10^4 ). Here,  n  and  m  denote the living room dimensions, while  a ,  b , and  c  represent the quantities of planks measuring  1 x 2 ,  2 x 1 , and  2 x 2  meters respectively. It's imperative not to rotate the planks.
+
+Output:
+If it proves impossible to adorn the room with the given set of planks, you should output "IMPOSSIBLE". Otherwise, you should provide one potential arrangement, consisting of  n  lines with  m  lowercase Latin letters each. Adjacent squares containing the same letter signify that they belong to the same plank. If the answer isn't unique, any valid arrangement will suffice.
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diff --git a/hard/day_20/sample_test_cases.txt b/hard/day_20/sample_test_cases.txt
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+Examples
+
+input
+2 6 2 2 1
+
+output
+aabcca
+aabdda
+
+input
+1 1 100 100 100
+
+output
+IMPOSSIBLE
+
+input
+4 4 10 10 10
+
+output
+aabb
+aabb
+bbaa
+bbaa
diff --git a/hard/day_20/solution.cpp b/hard/day_20/solution.cpp
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+//write your code here
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