#include <iostream>
#include <fstream>
using namespace std;

int main()
{
	ifstream fin;
	ofstream fout;
	fin.open("input.txt");
	fout.open("output.txt");
	int points;
	fin >> points;
	int** arr = new int* [points];
	for (int i = 0; i < points; i++)
	{
		arr[i] = new int[points];
	}

	for (int i = 0; i < points; i++)
	{
		for (int j = 0; j < points; j++)
		{
			fin >> arr[i][j];
		}
	}

	for (int i = 0; i < points; i++)
	{
		for (int j = 0; j < points; j++)
		{
			if (arr[i][j] != arr[j][i])
			{
				fout << "NO";
				return -1;
			}
			if (i == j && arr[i][j] == 1)
			{
				fout << "NO";
				return -2;
			}
		}
	}
	fout << "YES";
	fin.close();
	fout.close();
}