Compilare: user.cpp: In function ‘bool cauta(int, int)’: user.cpp:11:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v[x].size();i++) ~^~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:21:27: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets (s,10000005,fin); ^ user.cpp:33:5: warning: ‘l’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (ls<l){ ^~