C++pair to group __c++

Pair to group:

Pair is equivalent to a structure with two elements

Call header file:

#include <algorithm>

using namespace Std;

Detailed usage (part):

pair<string, double> p2------P2 has two types, the first element is string, and the second element is double

P2 = Make_pair ("AA", 5.0)------for P2 assignment

Pair<string, double> p3 (p2)------pair Copy

P2.first------Access the first element in pair

P2.second------Access to the second element in pair

Sort:

BOOL Comp (pair<int, int> A, pair<int, int> b)

{ ...... }

If there is no write-sort function, the first element is sorted by default, if the same is sorted by the second element (small to large)

#include <stdio.h>
#include <algorithm>
using namespace std;
Pair<int, int> p[15];
BOOL Comp (pair<int, int> A, pair<int, int> b)
{
	if (A.first>b.first | | A.first==b.first & & A.second>b.second) return
		1;
	return 0;
}
int main (void)
{
	int i, j, k = 0;
	for (i=3;i>=1;i--)
	{
		for (j=1;j<=4;j++)
			p[++k] = Make_pair (i, j);
	}
	Sort (p+1, p+k+1);
	for (i=1;i<=k;i++)
		printf ("%d%d\n", P[i].first, P[i].second);
	printf ("\ n");
	Sort (p+1, p+k+1, comp);
	for (i=1;i<=k;i++)
		printf ("%d%d\n", P[i].first, P[i].second);
	return 0;
}