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:49:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(st.size()<k1) ^ user.cpp:54:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(nr && st.size()<k1) ^ user.cpp:60:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(nr2 && st.size()<k1) ^ user.cpp:81:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(st.size()<k1) ^ user.cpp:94:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(st.size()>=ultims) ^ user.cpp:120:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(st.size()<k1) ^