Compilare: user.cpp: In function ‘int main()’: user.cpp:65:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (g[i].size() == r) { ^ user.cpp:73:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 1; i < init_ind.size(); ++i) ^ user.cpp:78:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 1; i < init_ind.size(); ++i) ^ user.cpp:86:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 1; i < init_ind.size(); ++i) ^ user.cpp: In function ‘void next_char()’: user.cpp:13:35: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, BUFF_SIZE, fin); ^