Compilare: user.cpp: In function ‘void read()’: user.cpp:53:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < N; i++) { ^ user.cpp: In function ‘void write()’: user.cpp:61:29: warning: format ‘%s’ expects argument of type ‘char*’, but argument 3 has type ‘char (*)[540]’ [-Wformat=] fprintf(f, "%s", DNA+N-1); ^ user.cpp: In function ‘void createGraph()’: user.cpp:65:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < N; i++) { ^