g++ -g -Wall -Wextra -Werror -D_GLIBCXX_DEBUG 
-D_GLIBCXX_DEBUG_PEDANTIC -Wconversion -lm -fsanitize=address
-fsanitize=bounds -Wshadow -D_FORTIFY_SOURCE=2 -fsanitize=undefined
-fno-sanitize-recover -Wformat=2 -std=c++14
-fno-stack-limit