Compilare: user.cpp: In function ‘void dijk(int)’: user.cpp:11:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[nod].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:27:7: warning: unused variable ‘j’ [-Wunused-variable] int i,j,a,b,c,x,q; ^ user.cpp:27:15: warning: unused variable ‘x’ [-Wunused-variable] int i,j,a,b,c,x,q; ^ user.cpp:27:17: warning: unused variable ‘q’ [-Wunused-variable] int i,j,a,b,c,x,q; ^ user.cpp:25:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] {freopen ("dijkstra.in","r",stdin); ^ user.cpp:26:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("dijkstra.out","w",stdout); ^ user.cpp:28:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:30:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] {scanf("%d%d%d",&a,&b,&c); ^ user.cpp: In function ‘void dijk(int)’: user.cpp:11:27: warning: ‘x’ may be used uninitialized in this function [-Wmaybe-uninitialized] for(i=0;i<v[nod].size();i++) ^