Compilare: main.cpp: In function 'bool verificare(std::__cxx11::string)': main.cpp:12:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0; i < s.length(); i++ ) { ~~^~~~~~~~~~~~ main.cpp:28:13: warning: this 'if' clause does not guard... [-Wmisleading-indentation] if ( q.front() == '[' ) ^~ main.cpp:30:17: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if' q.pop(); ^