Compilare: user.cpp: In function ‘int main()’: user.cpp:19:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v[r].size();i++){ ^ user.cpp:25:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i==v[r].size()) ^ user.cpp:30:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v[r].size();i++){ ^ user.cpp:36:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i<v[r].size()) ^ user.cpp:12:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&n); ^ user.cpp:14:37: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d %d",&cer,&x); ^