Compilare: main.cpp: In function 'int main()': main.cpp:70:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t i = 1; i <= n; i++) ~~^~~~ main.cpp:80:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (coada.size() == u) ~~~~~~~~~~~~~^~~~ main.cpp:82:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (coada.size() != l) ~~~~~~~~~~~~~^~~~ main.cpp:69:6: warning: unused variable 'sfarsit' [-Wunused-variable] int sfarsit = 1; ^~~~~~~ main.cpp: In function 'char read(FILE*)': main.cpp:23:27: 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, len, f); ^