Compilare: user.cpp: In function ‘int main()’: user.cpp:123:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=1; j<vc[i].size(); j++) ^ user.cpp:78:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d",&n,&m); ^ user.cpp:84:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d",&a,&b); ^