#include<iostream> #include<algorithm> using namespace std; struct itn{ int a,b; }; bool cmp(itn a,itn b){ if(a.a!=b.a){ return a.a<b.a; } return a.b<b.b; } int main(){ int a; itn b[100005]; cin>>a; for(int i=1;i<=a;i=i+1){ cin>>b[i].a>>b[i].b; } sort(b+1,b+a+1,cmp); for(int i=1;i<=a;i=i+1){ cout<<b[i].a<<' '<<b[i].b<<'\n'; } return 0; }