CXXFLAGS := -std=c++20 -O2 -Wall -Wextra

sources := $(wildcard *.cc)
progs := $(patsubst %.cc,%,$(sources))

.PHONY: all
all: $(progs)

.PHONY: clean
clean:
	rm -f $(progs) $(progs:=_test.txt)

.PHONY: test
test: $(addprefix test-,$(progs))

.PHONY: test-%
test-%: %_test.txt
	@test -f $*_output.txt && (diff -u $*_output.txt $<; rm -f $<) || true
	@test -f $*_output.txt || cat $<

$(progs:=_test.txt): %_test.txt: %
	./$< $*_input.txt > $@