Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:52:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v2[nod].size(); i++){ ^ user.cpp: In function ‘int main()’: user.cpp:105:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0; j < v[nod].size(); j++){ ^ user.cpp:121:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0; j < v[nod].size(); j++){ ^ user.cpp: In function ‘int num()’: user.cpp:62:35: 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, DIM1, fin); ^ user.cpp:71:35: 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, DIM1, fin); ^ user.cpp: In function ‘int main()’: user.cpp:78:27: 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, DIM1, fin); ^