Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:14:5: error: ‘stack’ was not declared in this scope stack <int> stiva; ^~~~~ user.cpp:14:12: error: expected primary-expression before ‘int’ stack <int> stiva; ^~~ user.cpp:19:17: error: ‘stiva’ was not declared in this scope v [ stiva.top() ] = i; ^~~~~ user.cpp:23:9: error: ‘stiva’ was not declared in this scope stiva.push(i); ^~~~~ user.cpp:11:47: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ( "parantezare.in" , "r" , stdin ); ^ user.cpp:12:49: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ( "parantezare.out" , "w" , stdout ); ^