Perfect PS Contest setting

mkdir {A..M}
touch {A..M}/main.cpp

# alias solve='g++ main.cpp -o main -g -fsanitize=undefined,address -fno-omit-frame-pointer -Wall -Wextra && echo "Compile Done" && time ./main'
# alias fast='g++ main.cpp -o main -O2 -Wall && echo "Compile Done" && time ./main'