Compilare: main.cpp: In function 'int main()': main.cpp:26:30: warning: suggest parentheses around '&&' within '||' [-Wparentheses] if(s.top().ch == '(' && c == ')' || s.top().ch == '[' && c == ']' || s.top().ch == '{' && c == '}') ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~ main.cpp:26:96: warning: suggest parentheses around '&&' within '||' [-Wparentheses] if(s.top().ch == '(' && c == ')' || s.top().ch == '[' && c == ']' || s.top().ch == '{' && c == '}') ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~