Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:129:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < v[nod].size(); i++){ ^ user.cpp:145:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < v[nod].size(); i++){ ^ user.cpp:160:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < w[nod].size(); i++){ ^ user.cpp: In function ‘int num()’: user.cpp:178:35: 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:187:35: 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:193:27: 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); ^