Compilare: user.cpp: In function ‘void solve()’: user.cpp:29:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[nod].size();i++) ^ user.cpp:21:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, k, val, nod; ^ user.cpp:21:15: warning: unused variable ‘k’ [-Wunused-variable] int i, j, k, val, nod; ^ user.cpp: In function ‘void citire()’: user.cpp:42:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&n,&m); ^ user.cpp:45:39: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d%d",&a,&b,&cost); ^