Compilare: main.cpp: In function 'int main()': main.cpp:26:59: warning: suggest parentheses around '&&' within '||' [-Wparentheses] 26 | } else if (!stk.empty() && (par[stk.top()] == '(' && par[i] == ')' || | ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~ main.cpp:28:59: warning: suggest parentheses around '&&' within '||' [-Wparentheses] 28 | par[stk.top()] == '{' && par[i] == '}')) { | ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~ main.cpp:22:9: warning: variable 'last_open' set but not used [-Wunused-but-set-variable] 22 | int last_open = -1; | ^~~~~~~~~