infoarena

/* an example of struct */ 
struct st_ex { 
    char product[16];
    float price;
};
 
/* qsort struct comparision function (price float field) */ 
int struct_cmp_by_price(const void *a, const void *b) 
{ 
    struct st_ex *ia = (struct st_ex *)a;
    struct st_ex *ib = (struct st_ex *)b;
    return (int)(100.f*ia->price - 100.f*ib->price);
	/* float comparison: returns negative if b > a 
	and positive if a > b. We multiplied result by 100.0
	to preserve decimal fraction */ 
 
} 
 
/* qsort struct comparision function (product C-string field) */ 
int struct_cmp_by_product(const void *a, const void *b) 
{ 
    struct st_ex *ia = (struct st_ex *)a;
    struct st_ex *ib = (struct st_ex *)b;
    return strcmp(ia->product, ib->product);
	/* strcmp functions works exactly as expected from
	comparison function */ 
} 

pair < int, int > S ;
sort ( S + 1, S + N + 1 ) .

typedef struct 
{
	int x,y;
}punct;

punct pt[100];

bool cmp(punct a,punct b)
{
	if(a.x<b.x) return 1;
	if(a.x==b.x) if(a.y<b.y) return 1;
}

int main()
{
   sort(pt+1,pt+n+1,cmp);
}

for ( int i = 1; i <= N; ++i ) {
    scanf ( "%d %d", &V[i].y, &V[i].x ) ;
}

  using namespace std;