Compilare: main.cpp: In member function 'int stiva::pop()': main.cpp:50:11: warning: converting to non-pointer type 'int' from NULL [-Wconversion-null] return NULL; ^~~~ main.cpp: In function 'int main()': main.cpp:93:13: warning: NULL used in arithmetic [-Wpointer-arith] if (p == NULL) ^~~~ main.cpp:97:22: warning: suggest parentheses around '&&' within '||' [-Wparentheses] else if (p == '(' && paranteza == ')' || p == '[' && paranteza == ']' || p == '{' && paranteza == '}') ~~~~~~~~~^~~~~~~~~~~~~~~~~~~ main.cpp:97:86: warning: suggest parentheses around '&&' within '||' [-Wparentheses] else if (p == '(' && paranteza == ')' || p == '[' && paranteza == ']' || p == '{' && paranteza == '}') ~~~~~~~~~^~~~~~~~~~~~~~~~~~~ main.cpp:72:22: warning: unused variable 'ok' [-Wunused-variable] bool corect = true, ok=true; ^~