Compilare: user.cpp: In function ‘void add(int)’: user.cpp:51:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[nod].size(); i++){ ^ user.cpp: In function ‘int num()’: user.cpp:84:36: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(sir, 1, DIM, fin); ^ user.cpp:93:36: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(sir, 1, DIM, fin); ^ user.cpp: In function ‘int main()’: user.cpp:100:28: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(sir, 1, DIM, fin); ^