#include<stdio.h>
#include<algorithm>
#include<set>
#include<math.h>
#include<stdlib.h>
#include<cstdio>
#include<cstring>
#include<cmath>
#include<cstdlib>
#include<cstdio>
#include<ctime>
#include<cctype>
#include<cassert>
#include<climits>
#include<cerrno>
#include<cfloat>
#include<ciso646>
#include<clocale>
#include<csetjmp>
#include<csignal>
#include<cstdarg>
#include<cstddef>
#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<ctime>
#include<cwchar>
#include<cwctype>
//containers
#include<vector>
#include<list>
#include<map>
#include<queue>
#include<deque>
#include<set>
#include<complex>
#include<string>
#include<stack>
#include<bitset>
#include<istream>
#include<valarray>
//IOs
#include<iostream>
#include<sstream>
#include<iomanip>
#include<fstream>
#include<exception>
#include<ios>
#include<iosfwd>
#include<ostream>
#include<iterator>
#include<stdexcept>
#include<streambuf>
//algorithm & miscellaneous
#include<algorithm>
#include<functional>
#include<numeric>
#include<utility>
#include<limits>
#include<locale>
#include<memory>
#include<new>
using namespace std;
struct test{
int a,b,c;
};
bool comp(const test d,const test e)
{
if(d.a==e.a)
return d.b<e.b; //Incresing Order according to second value (if first values are equal)
else
return d.a<e.a; //Increasing Order according to First value (if first values are not equal)
}
bool comp1(const test d,const test e)
{
if(d.a==e.a)
return d.b>e.b; //Dncresing Order according to second value (if first values are equal)
else
return d.a>e.a; //Dncreasing Order according to First value (if first values are not equal)
}
int main()
{
struct test arr[20]={0};
int i,m,r,t;
scanf("%d",&t);
for(i=0;i<t;i++)
scanf("%d %d",&arr[i].a,&arr[i].b);
for(int i=0;i<t;i++)
printf("%d %d\n",arr[i].a,arr[i].b);
sort(arr,arr+t,comp);
printf("\n\n");
for(int i=0;i<t;i++)
printf("%d %d\n",arr[i].a,arr[i].b);
sort(arr,arr+t,comp1);
printf("\n\n");
for(int i=0;i<t;i++)
printf("%d %d\n",arr[i].a,arr[i].b);
return 0;
}
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