Compilare: main.cpp: In function 'int main()': main.cpp:25:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ( st.size() == k ) timp [ t ] = sum ; ~~~~~~~~~~^~~~ main.cpp:27:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ( st.size() == k + 1 ) sum -= *st.begin() , st.erase( st.begin() ) , timp [ t ] = sum ; ~~~~~~~~~~^~~~~~~~