Compilare: main.cpp: In function 'bool cmp(lol, lol)': main.cpp:10:37: warning: suggest parentheses around '&&' within '||' [-Wparentheses] return (l.k2>r.k2 || l.k2==r.k2 && l.k3<r.k3); ~~~~~~~~~~~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:25:76: warning: suggest parentheses around '&&' within '||' [-Wparentheses] for (int i=2; i<=n; ++i) if (a[i].val!=a[i-1].val || a[i].k2<a[i-1].k2 && a[i].k3<a[i-1].k3) return cout<<-1,0; ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~