intervale crescatoare

/// se dau n intervale de forma [A,B],
///afisati aceste intervale crescator dupa A
///si apoi dupa B
#include <bits/stdc++.h>

using namespace std;
struct interval
{
int a,b;
}v[101];
bool cmp(interval p,interval q)
{
    if(p.a<q.a) return 1;
    if(p.a==q.a) return (p.b<q.b);
    if(p.a>q.a) return 0;
}
int main()
{
    int n;
    cin>>n;
    for(int i=1;i<=n;i++)
    {
        cin>>v[i].a>>v[i].b;
    }
    sort(v+1,v+n+1,cmp);
    for(int i=1;i<=n;i++)
    {
        cout<<v[i].a<<" "<<v[i].b<<endl;

    }
    return 0;
}