Compilare: user.cpp: In function ‘void df(int, int)’: user.cpp:25:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v[x2].size();j++) ^ user.cpp:31:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(t=0;t<v[x3].size();t++) ^ user.cpp: In function ‘int main()’: user.cpp:83:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<sol2.size();i++) ^ user.cpp: In function ‘void citire()’: user.cpp:67:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d%d",&n,&m,&x); ^ user.cpp:68:44: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(i=1;i<=n;i++)fscanf(f,"%d",&val[i]); ^ user.cpp:71:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&a,&b); ^