Compilare: user.cpp: In function ‘int cond1()’: user.cpp:18:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(st.size()+n-i>=k1) ^ user.cpp: In function ‘int main()’: user.cpp:39:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(st.size()<k1) ^ user.cpp:55:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(st.size()<k1) ^ user.cpp:68:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(st.size()>=ultims) ^ user.cpp:93:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(st.size()<k1) ^