Compilare: user.cpp: In function ‘int main()’: user.cpp:25:145: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(!st.empty() && ((p[i].first>st.top().first) || (p[i].first==st.top().first && p[i].second>st.top().second)) && st.size()+n-i>=k1) ^ user.cpp:31:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(st.size()<k1) ^ user.cpp:39:145: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(!st.empty() && ((p[i].first>st.top().first) || (p[i].first==st.top().first && p[i].second>st.top().second)) && st.size()+n-i>=k1) ^ user.cpp:45:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if( st.size()<k1) ^ user.cpp:53:159: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(!st.empty() && y.top()==0 && ((p[i].first>st.top().first) || (p[i].first==st.top().first && p[i].second>st.top().second)) && st.size()+n-i>=k1) ^ user.cpp:58:157: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(!st.empty() && y.top()==1 && ((p[i].second>st.top().first) || (p[i].second==st.top().first && p[i].first>st.top().second)) && st.size()+n-i>=k1) ^ user.cpp:63:149: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(!st.empty() && ((p[i].first>st.top().first) || (p[i].first==st.top().first && p[i].second>st.top().second)) && st.size()+n-i>=k1) ^ user.cpp:69:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(st.size()<k1) ^ user.cpp:76:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(st.size()<k1) ^