Compilare: user.cpp: In function ‘unsigned int solutie(int)’: user.cpp:26:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] {return k==n;} ~^~~ user.cpp: In function ‘void tipar()’: user.cpp:31:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<=n;i++) ~^~~ user.cpp: In function ‘void bt(int)’: user.cpp:40:11: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(valid (k)) ^