Compilare: user.c: In function 'update_sourceDist': user.c:153: warning: unused variable 'a2' user.c:153: warning: unused variable 'a1' user.c: In function 'dijkstra': user.c:167: warning: unused variable 'h' user.c: In function 'main': user.c:275: warning: control reaches end of non-void function user.c: In function 'minim': user.c:139: warning: 'index' may be used uninitialized in this function