逛超市的灵感c++

大家逛超市是否为找东西而烦恼！！！？？？

#include
#include
using namespace std;
map  > m; 
const int N = 1e6 + 10;
string f[N];
int len;
bool fx[N], fy[N];
int main(){
	while(1) {
		int a;
		cout << "1.查找" << endl << "2.存入" << endl << "3.所有物品" << endl;
		cin >> a;
		system ("cls");
		if (a == 1) {
			string st;
			cout << "请输入查找对象" << endl;
			cin >> st;
			pair  z = m[st];
			int xx = z.first;
			int yy = z.second;
			if (xx == 0 || yy == 0) cout << "不存在" << endl; 
			else cout << xx << ' ' << yy << endl;
			system ("pause");
			system ("cls");
		}
		else if (a == 2) {
			string st;
			cout << "请输入存入对象的名称，以及它的坐标（x > 0, y > 0)" << endl;
			int x, y;
			cin >> st;
			cin >> x >> y;
			if (fx[x] && fy[y]) cout << "该位置已存在物品" << endl;
			else {
				m[st] = make_pair (x, y);
				f[++len] = st; 
				fx[x] = true;
				fy[y] = true;
				cout << "已存入" << endl;
			}
			system ("pause");
			system ("cls");
		}
		else if (a == 3) {
			cout << "共" << len << "件物品：" << endl;
			for (int i = 1; i <= len; i++) 
				cout << f[i] << ' ' << m[f[i]].first << ' ' << m[f[i]].second << endl;
			system ("pause");
			system ("cls");
		} 
	}
	return 0;
}

如果你是超市经理，请别忘了给我钱，我不贪，1万就够