Compilare: main.cpp: In function 'void solve()': main.cpp:48:21: warning: logical not is only applied to the left hand side of comparison [-Wlogical-not-parentheses] while (!st.size() > 1 && a[st.top()] <= a[i]) ^ main.cpp:48:21: warning: comparison of constant '1' with boolean expression is always false [-Wbool-compare] while (!st.size() > 1 && a[st.top()] <= a[i]) ~~~~~~~~~~~^~~