Merge pull request #5997 from dcw803/master

imported my solutions to this week's tasks - both Perl

6 files changed, 39630 insertions, 39 deletions

diff --git a/challenge-161/duncan-c-white/C/README b/challenge-161/duncan-c-white/C/README
index 8fcb95df91..61d52a58c0 100644
--- a/challenge-161/duncan-c-white/C/README
+++ b/challenge-161/duncan-c-white/C/README
@@ -1 +1,3 @@
 Thought I'd also have a go at translating ch-1.pl into C..
+
+Produces identical (non-debugging) output to my ch-1.pl:-)
diff --git a/challenge-161/duncan-c-white/C/ch-1.c b/challenge-161/duncan-c-white/C/ch-1.c
new file mode 100644
index 0000000000..75c8ef9965
--- /dev/null
+++ b/challenge-161/duncan-c-white/C/ch-1.c
@@ -0,0 +1,154 @@
+/* 
+ * TASK #1 - Abecedarian Words
+ * 
+ * An abecedarian word is a word whose letters are arranged in alphabetical
+ * order. For example, 'knotty' is an abecedarian word, but 'knots'
+ * is not. Output or return a list of all abecedarian words in the
+ * dictionary, sorted in decreasing order of length.
+ * 
+ * Optionally, using only abecedarian words, leave a short comment in
+ * your code to make your reviewer smile.
+ * 
+ * MY NOTES: ok.  Pretty easy.  Amusing phrase:
+ * "I am not a cellos guy"  (Jealous Guy, Roxy Music)
+ */ 
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <string.h>
+#include <assert.h>
+#include <unistd.h>
+#include <ctype.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+
+
+
+/*
+ * bool isabeced = is_abeced( char *word );
+ *	Return true iff word is an Abecedarian-word, i.e. all
+ *	it's letters are in sorted order.
+ */
+bool is_abeced( char *word )
+{
+	int len = strlen(word);
+	for( int i=0; i<len-1; i++ )
+	{
+		//printf( "debug: i=%d, w[i]=%c, w[i+1]=%c\n",
+		//	i, word[i], word[i+1] );
+		if( word[i] > word[i+1] )
+		{
+			return false;
+		}
+	}
+	//printf( "debug: word %s is abecedarian\n", word );
+	return true;
+}
+
+bool debug=false;
+#define DICTFILE "../dictionary.txt"
+
+
+int compareword(const void *av, const void *bv)
+{
+	char **a = (char **)av;
+	char **b = (char **)bv;
+	//printf( "debug: cw: a=%s, b=%s\n", *a, *b );
+	int x = strlen(*b) - strlen(*a);		// descending order
+	if( x != 0 ) return x;
+	return strcmp(*a,*b);
+}
+
+
+int main( void )
+{
+	#if 0
+	bool isabeced = is_abeced( "hello" );
+	printf( "debug: abeced(hello)=%d\n", (int)isabeced );
+	exit(1);
+	isabeced = is_abeced( "xv" );
+	printf( "debug: abeced(xv)=%d\n", (int)isabeced );
+	exit(1);
+	#endif
+
+	struct stat st;
+	if( stat( DICTFILE, &st ) != 0 )
+	{
+		fprintf( stderr, "Abecedarian-words: can't stat " DICTFILE );
+		exit(1);
+	}
+	int size = st.st_size;
+
+	// Allocate a dictionary buffer for all dictionary words
+	char *dictbuf = malloc( size+1 );
+	assert( dictbuf != NULL );
+
+	// allocate an equivalent buffer for abecedarian words
+	char *abecbuf = malloc( size+1 );
+	assert( abecbuf != NULL );
+
+	// read the entire dictionary into dictbuf in one fell swoop
+	int fd = open( DICTFILE, O_RDONLY );
+	assert( fd != -1 );
+	int haveread = read(fd, dictbuf, size);
+	assert( haveread==size );
+	dictbuf[size-1] = '\0';
+	close(fd);
+
+	// modify the dictbuf: lower casing it, separating words
+	// and counting them too
+	char *s = dictbuf;
+	int nwords = 1;
+	for( int i=0; i<size; i++ )
+	{
+		*s = tolower(*s);
+		if( *s == '\n' )
+		{
+			*s = '\0';
+			nwords++;
+		}
+		s++;
+	}
+
+	printf( "debug: Found %d words\n", nwords );
+	//exit(1);
+
+	char **abecedword = malloc( nwords * sizeof(char *) );
+	assert( abecedword != NULL );
+
+	// Select only those words which are abeced..
+	char *src = dictbuf;
+	char *dst = abecbuf;
+	int nsel = 0;
+	for( int w=0; w<nwords; w++ )
+	{
+		//printf( "debug: word %d=%s\n", w, src );
+		int len = strlen(src);
+		if( is_abeced(src) )
+		{
+			printf( "debug: abeced word %d=%s\n", nsel, src );
+			abecedword[nsel] = dst;
+			strcpy( dst, src );
+			dst += len+1;
+			nsel++;
+		}
+		src += len+1;
+	}
+
+	printf( "debug: Found %d Abecedarian words\n", nsel );
+	//exit(1);
+
+	// sort selected word array in descending order of length
+	qsort( abecedword, nsel, sizeof(char *), &compareword );
+
+	// display the Abecedarian words
+	for( int i=0; i<nsel; i++ )
+	{
+		printf( "%s\n", abecedword[i] );
+	}
+
+	return 0;
+}
diff --git a/challenge-161/duncan-c-white/README b/challenge-161/duncan-c-white/README
index b73af0151f..a10c12ba95 100644
--- a/challenge-161/duncan-c-white/README
+++ b/challenge-161/duncan-c-white/README
@@ -1,58 +1,52 @@
-TASK #1 - Four Is Magic
+TASK #1 - Abecedarian Words
 
-You are given a positive number, $n < 10.
+An abecedarian word is a word whose letters are arranged in alphabetical
+order. For example, 'knotty' is an abecedarian word, but 'knots'
+is not. Output or return a list of all abecedarian words in the
+dictionary, sorted in decreasing order of length.
 
-Write a script to generate english text sequence starting with the English
-cardinal representation of the given number, the word 'is' and then
-the English cardinal representation of the count of characters that made
-up the first word, followed by a comma. Continue until you reach four.
+Optionally, using only abecedarian words, leave a short comment in your code to make your reviewer smile.
 
-Example 1:
-
-	Input: $n = 5
-	Output: Five is four, four is magic.
-
-Example 2:
-
-	Input: $n = 7
-	Output: Seven is five, five is four, four is magic.
+MY NOTES: ok.  Pretty easy.
 
-Example 3:
+GUEST LANGUAGE: As a bonus, I also had a go at translating ch-1.pl into C,
+look in the C directory for that.
 
-	Input: $n = 6
-	Output: Six is three, three is five, five is four, four is magic.
 
-MY NOTES: ok.  Pretty easy.
+TASK #2 - Pangrams
 
-GUEST LANGUAGE: As a bonus, I'd also have a go at translating ch-1.pl into C,
-look in the C directory.
+A pangram is a sentence or phrase that uses every letter in the English
+alphabet at least once. For example, perhaps the most well known
+pangram is:
 
+the quick brown fox jumps over the lazy dog
 
-TASK #2 - Equilibrium Index
+Using the provided dictionary, so that you don't need to include
+individual copy, generate at least one pangram.
 
-You are give an array of integers, @n.
+Your pangram does not have to be a syntactically valid English sentence
+(doing so would require far more work, and a dictionary of nouns, verbs,
+adjectives, adverbs, and conjunctions). Also note that repeated letters,
+and even repeated words, are permitted.
 
-Write a script to find out the Equilibrium Index of the given array, if found.
+BONUS: Constrain or optimize for something interesting (completely up
+to you), such as:
 
-For an array A consisting n elements, index i is an equilibrium index
-if the sum of elements of subarray A[0..i-1] is equal to the sum of
-elements of subarray A[i+1..n-1].
+Shortest possible pangram (difficult)
 
-Example 1:
+Pangram which contains only abecedarian words (see challenge 1)
 
-	Input: @n = (1, 3, 5, 7, 9)
-	Output: 3
+Pangram such that each word "solves" exactly one new letter. For example,
+such a pangram might begin with (newly solved letters in bold):
+    a ah hi hid die ice tea ...
 
-Example 2:
+    (What is the longest possible pangram generated with this method? All
+    solutions will contain 26 words, so focus on the letter count.)
 
-	Input: @n = (1, 2, 3, 4, 5)
-	Output: -1 as no Equilibrium Index found.
+Pangrams that have the weirdest (PG-13) Google image search results
 
-Example 3:
+Anything interesting goes!
 
-	Input: @n = (2, 4, 2)
-	Output: 1
 
-MY NOTES: ok.  Pretty easy.  Rather than recomputing sums each time,
-let's keep track of "the sum before i" and "the sum after i" and
-adjust them each pass..
+MY NOTES: hmmm.  Pretty easy to find a pangram in a brute force fashion,
+but anything more constrained sounds pretty hard.
diff --git a/challenge-161/duncan-c-white/dictionary.txt b/challenge-161/duncan-c-white/dictionary.txt
new file mode 100644
index 0000000000..1f915f2975
--- /dev/null
+++ b/challenge-161/duncan-c-white/dictionary.txt
@@ -0,0 +1,39172 @@
+a
+aardvark
+aback
+abacus
+abacuses
+abandon
+abandoned
+abandoning
+abandonment
+abandons
+abate
+abated
+abates
+abating
+abbey
+abbeys
+abbot
+abbots
+abbreviate
+abbreviated
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+abbreviating
+abbreviation
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+abdicate
+abdicated
+abdicates
+abdicating
+abdication
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+abdomens
+abdominal
+abduct
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