Compilare: user.cpp: In function ‘void prim(int)’: user.cpp:54:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i< G[vfs].c.size(); ++i){ ^ user.cpp:72:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( i = 0; i < G[vfmin].v.size(); ++i){ ^ user.cpp: In function ‘void init()’: user.cpp:30:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d",&n, &m); ^ user.cpp:34:43: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d %d", &x, &y, &c); ^ user.cpp: In function ‘void prim(int)’: user.cpp:72:41: warning: ‘vfmin’ may be used uninitialized in this function [-Wmaybe-uninitialized] for( i = 0; i < G[vfmin].v.size(); ++i){ ^