Compilare: user.c: In function 'scan': user.c:22: warning: unused variable 'k' user.c:21: warning: unused variable 's' user.c:46:5: warning: "/*" within comment user.c: In function 'solve': user.c:41: warning: unused variable 'x' user.c:41: warning: unused variable 'nr' user.c:41: warning: unused variable 'k' user.c:41: warning: unused variable 'j' user.c:41: warning: unused variable 'i' user.c: In function 'main': user.c:66: warning: control reaches end of non-void function