diff --git a/day11/Makefile b/day11/Makefile
new file mode 100644
index 0000000..dcd6a88
--- /dev/null
+++ b/day11/Makefile
@@ -0,0 +1,36 @@
+
+OPT_FLAGS?= -march=native -flto \
+	 -fgraphite -fopenmp -floop-parallelize-all -ftree-parallelize-loops=4 \
+	 -floop-interchange -ftree-loop-distribution -floop-strip-mine -floop-block \
+	 -fno-stack-check -fno-strict-aliasing 
+
+CFLAGS+= -Wall -pedantic --std=gnu11 -Wextra -Wstrict-aliasing
+CFLAGS+= $(OPT_FLAGS)
+CFLAGS+= -O3 -pipe
+LDFLAGS?= -O3 -flto
+
+INCLUDE?=../common/include
+CFLAGS+= -I$(INCLUDE)
+
+STRIP=strip
+
+.PHONY: all
+all: part1 part2
+
+inpu%-sz.h: inpu%
+	echo "#define input_sz (`head -n 1 $< | wc -m`)" > $@
+
+inpu%.h: inpu% | input-sz.h
+	@rm -f $@
+	while read line; do \
+		echo "\"$$line\"," >> $@; \
+	done < $<
+	
+
+part1: day11.c | input.h
+	$(CC) $< $(CFLAGS) -o $@ $(LDFLAGS)
+	$(STRIP) $@
+
+clean:
+	rm -f input{,-sz}.h
+	rm -f part{1,2}
diff --git a/day11/day11.c b/day11/day11.c
new file mode 100644
index 0000000..4e1144a
--- /dev/null
+++ b/day11/day11.c
@@ -0,0 +1,69 @@
+#include <stdlib.h>
+
+#include <panic.h>
+#include <attrs.h>
+
+const char* const input[] = {
+#include "input.h"
+};
+
+// input_sz //
+#include "input-sz.h"
+#define INPUT_WIDTH (input_sz-1)
+#define INPUT_HEIGHT (sizeof(input)/sizeof(char*)) 
+
+#define box(t) aligned_alloc(_Alignof(t), sizeof(t))
+
+enum gol_state {
+	STATE_INVALID=0,
+	STATE_FLOOR='.',
+	STATE_EMPTY='L',
+	STATE_OCCU='#',
+};
+
+#define GOL_INDEX(w,h) ((h*INPUT_WIDTH)+w)
+
+typedef struct gol_arena {
+	enum gol_state arena[INPUT_HEIGHT*INPUT_WIDTH];
+} gol_t;
+
+gol_t* gol_clone(const gol_t* from)
+{
+	gol_t* out = box(gol_t);
+	*out = *from;
+	return out;
+}
+
+pure gol_t generate_arena()
+{
+	gol_t gol;
+	for(size_t h=0;h<INPUT_HEIGHT;h++)
+		for(size_t w=0;w<INPUT_WIDTH;w++)
+			if( !(gol.arena[ (h*INPUT_WIDTH)+w ] = (enum gol_state) input[h][w]) ) panic("Invalid `gol_state` char at (%lu x %lu = %lu) '%c' (%d)", w, h, GOL_INDEX(w,h), input[h][w], (int)input[h][w]);
+
+	return gol;
+}
+
+static inline pure enum gol_state gol_index(const gol_t* gol, int x, int y)
+{
+	if (x<0 || x >= (int)INPUT_WIDTH || y<0 || y >= (int)INPUT_HEIGHT) return STATE_FLOOR;
+	return gol->arena[GOL_INDEX(x,y)];
+}
+
+static inline void gol_set(gol_t* restrict gol, int x,int y, enum gol_state st)
+{
+	if (x<0 || x >= (int)INPUT_WIDTH || y<0 || y >= (int)INPUT_HEIGHT) return;
+
+	gol->arena[GOL_INDEX(x,y)] = st;
+}
+
+int main()
+{
+	gol_t* arena = box(gol_t);
+	*arena = generate_arena();
+
+	printf("%lu\n", sizeof(arena));
+
+	free(arena);
+	return 0;
+}