Compilare: main.cpp: In function 'int main()': main.cpp:32:28: warning: suggest parentheses around '&&' within '||' [-Wparentheses] if (c==')' && st[vf]=='(' || c==']' && st[vf]=='[' || c=='}' && st[vf]=='{') ~~~~~~~^~~~~~~~~~~~~~ main.cpp:32:78: warning: suggest parentheses around '&&' within '||' [-Wparentheses] if (c==')' && st[vf]=='(' || c==']' && st[vf]=='[' || c=='}' && st[vf]=='{') ~~~~~~~^~~~~~~~~~~~~~ main.cpp:30:17: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] else if (c==')' || c==']' || c=='}') ^