GFG MAP PAIRS-STL

#include <bits/stdc++.h>

using namespace std;

map<pair<int, int>, int> vis;

void printPositions(int a[3][3]) {
	for (int i = 0; i < 3; i++)
		for (int j = 0; j < 3; j++)
			if (vis[{ i, j }] == 0)
				cout << "(" << i << ", " << j << ")" << endl;
}

int main() {
	int mat[3][3] = { { 0, 1, 2 }, { 3, 4, 5 }, { 6, 7, 8 } };
	vis[{ 0, 0 }] = 1;
	vis[{ 1, 0 }] = 1;
	vis[{ 1, 1 }] = 1;
	vis[{ 2, 2 }] = 1;
	printPositions(mat);
	return 0;
}