Compilare: main.cpp: In function 'void back()': main.cpp:30:13: warning: this 'if' clause does not guard... [-Wmisleading-indentation] if (as); ^~ main.cpp:31:17: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if' valid ();} ^~~~~ main.cpp:37:17: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for (i=1; i<=p; i++) ^~~ main.cpp:39:21: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' fout<<endl; ^~~~