Compilare: main.cpp: In function 'bool ok(char*)': main.cpp:23:25: warning: this 'else' clause does not guard... [-Wmisleading-indentation] else ^~~~ main.cpp:28:29: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'else' if(s[i]==']') ^~ main.cpp:12:9: warning: unused variable 'lg' [-Wunused-variable] int lg=strlen(s); ^~