Compilare: user.cpp: In function ‘int main()’: user.cpp:30:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ( n - i + st.size() == m ) ^ user.cpp:41:79: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while ( !st.empty() && st.top() < v[ i ] && n - i - 1 + st.size() >= m ) ^ user.cpp:45:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ( st.size() < m ) ^