Compilare: user.cpp: In function ‘int main()’: user.cpp:47:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(varb.size()!=n) ^ user.cpp:49:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<M.size();i++) ^ user.cpp:50:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j!=varb.size();j++) ^ user.cpp:68:35: warning: unknown conversion type character 0xa in format [-Wformat=] fprintf(g,"%d%\n%d\n",cost,n-1); ^ user.cpp:30:27: 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:33:37: 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,&ct); ^ user.cpp:27:31: warning: ‘j’ may be used uninitialized in this function [-Wmaybe-uninitialized] int t,i,n,m,a,b,ct,cost,p,j; ^