Compilare: user.cpp: In function ‘int main()’: user.cpp:60:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0; j < w[ v[i] ].size(); j++){ ^ user.cpp: In function ‘int num()’: user.cpp:21:34: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(s, 1, DIM, fin); ^ user.cpp:30:34: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(s, 1, DIM, fin); ^ user.cpp: In function ‘int main()’: user.cpp:36:26: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(s, 1, DIM, fin); ^