chore: day 19

Easy/Day 19/problem.txt

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+Given is a 2×2 matrix A.The determinant of A can be found as ad−bc.
+Find the determinant of the given matrix.
+A = | a b |
+    | c d |
+
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------
+
+Input:
+First line of input contains two integers a, b.
+Second line of input contains two integers c, d.
+
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------
+
+Output:
+Print the determinant.
+
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------
+
+(-100 <= a, b, c, d <= 100).
+Time Limit: 2 sec
+Memory Limit: 1024 MB

Easy/Day 19/sample_tc.txt

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+Sample Input 1:
+1 2
+3 4
+
+Sample Output 1:
+-2
+
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------
+
+Sample Input 2:
+0 -1
+1 0
+
+Sample Output 2:
+1

Easy/Day 19/solution.cpp

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+// Write your code here.