Compilare: user.cpp: In function ‘int main()’: user.cpp:23:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<v[i].size();j++){ ^ user.cpp:24:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (k=j+1;k<v[i].size();k++){ ^ user.cpp:13:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d",&n,&ma); ^ user.cpp:15:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d",&a,&b); ^