Compilare: main.cpp: In member function 'bool Matcher::pairup(int)': main.cpp:20:32: warning: suggest parentheses around assignment used as truth value [-Wparentheses] 20 | return r[l[v] = u] = v; main.cpp:22:32: warning: suggest parentheses around assignment used as truth value [-Wparentheses] 22 | return r[l[v] = u] = v;