rename repo, subdir for yearly challenges

2020/templates/Makefile

@@ -0,0 +1,26 @@
+INPUT := INPUT.txt
+SHELL := /bin/bash
+CFLAGS := -w
+TIME := \time -f "\ttime: %E real, %U user, %S sys\n\tcontext-switch:\t%c+%w, page-faults: %F+%R\n"
+export PATH := .:$(PATH)
+
+.PHONY: clean all compile deploy ex1 ex2
+
+all: ex1 ex2
+
+compile: ex1-c ex2-c
+
+ex1: ex1-c
+	@$(TIME) ex1.bash < $(INPUT)
+	@$(TIME) ex1-c < $(INPUT)
+
+ex2: ex2-c
+	@$(TIME) ex2.bash < $(INPUT)
+	@#$(TIME) ex2-sort.bash < $(INPUT)
+	@$(TIME) ex2-c < $(INPUT)
+
+clean:
+	@rm -f ex1-c ex2-c core
+
+deploy:
+	@$(MAKE) -C .. deploy

2020/templates/ex1-c.c

@@ -0,0 +1,38 @@
+/* ex1-c: Advent2020 game, day 3/game 1
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#define	XMOVE 3
+
+int my_strlen(str)
+     char *str;
+{
+     int i;
+     for (i=0; *str; ++i, ++str)
+          ;
+     return i;
+}
+
+
+int main(ac, av)
+     char **av;
+{
+
+     int col=0, line=0, linelen=0, mod=0, count=0;
+     char str[80];
+
+     scanf("%s", str);          /* ignore 1st line */
+
+     while (scanf("%s", str) != EOF) {
+          line++;
+          col+=XMOVE;
+          linelen=my_strlen(str);
+          mod=col%linelen;
+          if (*(str+mod) == '#')
+               count++;
+     }
+     printf ("%s : lines:%d pos:%d found:%d\n", *av, line, col, count);
+     exit (0);
+}

2020/templates/ex1.bash

@@ -0,0 +1,21 @@
+#!/bin/bash
+#
+# ex1.bash: Advent2020 game, day 3/game 1.
+
+CMD=${0##*/}
+
+XMOVE=3											  # 3 right
+
+declare -i xpos=0 ypos=0 count=0 linelen=0 modpos=0
+
+read -r line									  # ignore 1st line
+
+while read -r line; do
+	(( ypos++ ))
+	(( xpos += XMOVE ))							  # move right
+	(( linelen = ${#line} ))
+	(( modpos = (xpos % linelen) ))
+	[[ ${line:modpos:1} = \# ]] && ((count++))
+done
+printf "%s : lines:%d pos=%d found:%d\n" "$CMD" $ypos $xpos $count
+exit 0

2020/templates/ex2-c.c

@@ -0,0 +1,60 @@
+/* ex1-c: Advent2020 game, day 3/game 2
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+struct {
+    int dx;
+    int dy;
+    int pos;
+    int count;
+} set[] = {
+    { 1,  1, 0, 0},
+    { 3,  1, 0, 0},
+    { 5,  1, 0, 0},
+    { 7,  1, 0, 0},
+    { 1,  2, 0, 0},
+    {-1, -1, 0, 0}              /* end marker - not necessary */
+};
+
+int my_strlen(str)
+    char *str;
+{
+    int i;
+    for (i=0; *str; ++i, ++str)
+        ;
+    return i;
+}
+
+int main(ac, av)
+    int ac;
+    char **av;
+{
+    int line=0, linelen=0, mod=0, i;
+    unsigned long res=1;
+    char str[80];
+
+    scanf("%s", str);          /* ignore 1st line */
+
+    while (scanf("%s", str) != EOF) {
+        line++;
+        linelen=my_strlen(str);
+        for (i=0; set[i].dx >= 0; ++i) {
+            if (! (line % set[i].dy )) { /* line ok for this set */
+                set[i].pos += set[i].dx; /* increment set column */
+                mod = set[i].pos % linelen;
+                if ( str[mod] == '#')
+                    set[i].count++;
+            }
+        }
+    }
+    printf("%s : ", *av);
+    for (i=0; set[i].dx != -1; ++i) {
+        printf("[%d]=[%d, %d, %d, %d] ", i,
+               set[i].dx, set[i].dy, set[i].pos, set[i].count);
+        res*=set[i].count;
+    }
+    printf ("res:%lu\n", res);
+    exit (0);
+}

2020/templates/ex2.bash

@@ -0,0 +1,34 @@
+#!/bin/bash
+#
+# ex1.bash: Advent2020 game, day 3/game 2.
+
+CMD=${0##*/}
+
+XMOVES=(1 3 5 7 1)								  # moves right
+YMOVES=(1 1 1 1 2)								  # moves down
+declare -i linelen=0 modpos=0 res=1
+declare -a xpos xcount
+
+read -r line									  # ignore 1st line
+
+while read -r line; do
+	(( ypos++ ))
+	(( linelen = ${#line} ))
+
+	for ((i=0; i<${#XMOVES[@]}; ++i)); do
+		if ((ypos % YMOVES[i] == 0)); then
+			(( xpos[i] += XMOVES[i] ))			  # move right
+			(( modpos = (xpos[i] % linelen) ))
+			[[ ${line:modpos:1} = \# ]] && ((xcount[i]++))
+		fi
+	done
+done
+echo "xpos=${xpos[*]} xcount=${xcount[*]}"
+printf "%s : " "$CMD"
+for ((i=0; i<${#XMOVES[@]}; ++i)); do
+	printf "[%d]=[%d, %d, %d, %d] " $i "${XMOVES[$i]}" "${YMOVES[$i]}" \
+		   "${xpos[$i]}" "${xcount[$i]}"
+	(( res *= xcount[i] ))
+done
+printf "res:%d\n " $res
+exit 0