结构体数组的排序以及删除

排序的话利用sort,但是要用cmp函数，删除的话只可以覆盖

#include
#include
#include
using namespace std;

struct st
{
	int a1;
	string b1;
}arr[50];

bool cmp(const st &x, const st &y)
{
	if (x.a1 == y.a1)
	{
		return x.b1 > y.b1;
	}
	else
	{
		return x.a1 < y.a1;
	}
}

int main()
{
	arr[0].a1 = 3; arr[0].b1 = "ccd";
	arr[1].a1 = 2; arr[1].b1 = "edc";
	arr[2].a1 = 1; arr[2].b1 = "gbf";
	arr[3].a1 = 2; arr[3].b1 = "sdf";

	sort(arr, arr + 4, cmp);
	for (int i = 0; i < 4; i++)
	{
		cout << arr[i].a1 << "  " << arr[i].b1 << endl;
	}
	cout << "删除元素就是讲数组后面的覆盖前面的" << endl;
	for (int i = 0; i < 4; i++)
	{
		if (arr[i].b1 == "edc")
		{
			arr[i] = arr[i + 1];
		}
	}
	for (int i = 0; i < 3; i++)
	{
		cout << arr[i].a1 << "  " << arr[i].b1 << endl;
	}
}