Compilare: user.cpp: In function ‘void afisare()’: user.cpp:10:5: warning: this ‘for’ clause does not guard... [-Wmisleading-indentation] for(i=1;i<=n;i++) ^~~ user.cpp:12:9: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘for’ g<<endl; ^ user.cpp: In function ‘void backtr(int)’: user.cpp:27:11: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(valid(k)) ^