DAYS = $(shell seq 1 25 | xargs printf "%02i\n")

.PHONY: all
all::

define make-day
all:: $1/run
.PHONY: $1/run
$1/run:
	@echo "== day $1 =="
	@echo -en "\npart 1: " && cd $1 && time python3 solve.py 1
	@echo -en "\npart 2: " && cd $1 && time python3 solve.py 2
	@echo ""
endef
$(foreach day,$(DAYS),$(eval $(call make-day,$(day))))