Compilare: main.cpp: In function 'int main()': main.cpp:62:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<Xs.size(); i++){ ~^~~~~~~~~~ main.cpp: In function 'char getChar()': main.cpp:22:37: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread (buffer, 1, 2048, fin); ^