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+# Algorithms and Data Structures: Tutorial 2
+
+This package contains the following files:
+
+* construct.h
+* construct.c
+* Ex1.c
+* Ex2.c
+
+Where construct is an minimal implementation of Lisp construct with
+`cons`, `car`, `cdr`, `length`, `nth` and `insert`.  It eases and simplifies
+the implementation of linked lists (and trees and and graphs if we study them
+later on).  All source files are as licensed under the Unlicense which states
+
+> This is free and unencumbered software released into the public domain.
+>
+> Anyone is free to copy, modify, publish, use, compile, sell, or
+> distribute this software, either in source code form or as a compiled
+> binary, for any purpose, commercial or non-commercial, and by any
+> means.
+>
+> In jurisdictions that recognize copyright laws, the author or authors
+> of this software dedicate any and all copyright interest in the
+> software to the public domain. We make this dedication for the benefit
+> of the public at large and to the detriment of our heirs and
+> successors. We intend this dedication to be an overt act of
+> relinquishment in perpetuity of all present and future rights to this
+> software under copyright law.
+>
+> THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+> EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+> MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+> IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+> OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+> ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+> OTHER DEALINGS IN THE SOFTWARE.
+>
+> For more information, please refer to <http://unlicense.org/>
+
+The solution of the second exercise uses the math library and thus
+it needs to by linked during compilation.  Both uses the `construct` library:
+
+    cc construct.c Ex1.c -o Ex1
+    cc construct.c Ex2.c -lm -o Ex2
+
+Additionally, `Ex2` requires a value of `x` to be entered from stdin:
+
+    ./Ex1
+    echo 7 | ./Ex2