Compilare: main.cpp: In function 'void afis(int)': main.cpp:10:3: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for(j=1;j<=n;j++) ^~~ main.cpp:12:5: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' g<<endl; ^ main.cpp: In function 'void back(int)': main.cpp:27:7: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] if(valid(i)) ^