Daffodil International University
Problem Link
//Please follow from main function
#include<bits/stdc++.h>
using namespace std;
/// Typedef
typedef long long ll;
typedef unsigned long ul;
typedef unsigned long long ull;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<ll> vll;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
typedef vector< pii > vii;
#define pb push_back
#define ppb pop_back
#define MP make_pair
#define ff first
#define ss second
#define sf scanf
#define pf printf
#define SQR(x) ((x)*(x))
#define loop(i, y) for(int i=0; i<int(y); i++)
#define FOR(i, x, y) for(int i=int(x); i<int(y); i++)
#define ROF(i, x, y) for(int i=int(x); i>=int(y); i--)
#define ALL(c) c.begin(), c.end()
#define SZ(c) int(c.size())
#define CLR(x, y) memset(x, y, sizeof(x))
#define READ(f) freopen(f, "r", stdin)
#define WRITE(f) freopen(f, "w", stdout)
#define FastIO ios_base::sync_with_stdio(false)
#define tr(it, container) for(auto it = container.begin(); it != container.end(); it++)
#define sci(x) scanf("%d", &x)
#define scii(x, y) scanf("%d %d", &x, &y)
#define sciii(x, y, z) scanf("%d %d %d", &x, &y, &z)
#define scl(x) scanf("%lld", &x)
#define scll(x, y) scanf("%lld %lld", &x, &y)
#define sclll(x, y, z) scanf("%lld %lld %lld", &x, &y, &z)
#define scllll(x, y, z, p) scanf("%lld %lld %lld %lld", &x, &y, &z, &p)
#define bitCheck(N,in) ((bool)(N&(1<<(in))))
#define bitOff(N,in) (N&(~(1LL<<(in))))
#define bitOn(N,in) (N|(1LL<<(in)))
#define bitFlip(a,k) (a^(1LL<<(k)))
#define unq(v) sort(all(v)), (v).erase(unique(all(v)),v.end())
#define common(a,b) sort(all(a)), sort(all(b)), a.erase(set_intersection(all(a),all(b),a.begin()),a.end())
#define uncommon(a,b) sort(all(a)), sort(all(b)), a.erase(set_symmetric_difference(all(a),all(b),a.begin()),a.end())
#define dbg(x) cout<<#x<<" = "<<x<<endl;
// template <typename T> using orderset = tree <T, null_type, less<T>, rb_tree_tag,tree_order_statistics_node_update>;
// *X.find_by_order(k) //returns the kth largest element.(0-based)
// X.order_of_key(val) //returns the no. of values less than val
// uniform random generator -->
// uniform_int_distribution<int> dist(0, 1);
// default_random_engine gen;
template <class T> inline T bigMod(T p,T e,T M){ ll ret = 1; for(; e > 0; e >>= 1){ if(e & 1) ret = (ret * p) % M; p = (p * p) % M; } return (T) ret;}
template <class T> inline T modInverse(T a,T M){return bigMod(a,M-2,M);}
template <class T> inline T gcd(T a,T b){if(b==0)return a;return gcd(b,a%b);}
template <class T> inline T lcm(T a,T b) {a=abs(a);b=abs(b); return (a/gcd(a,b))*b;}
template <class T> inline string int2String(T a){ostringstream str; str<<a; return str.str();}
const int dr[] = { 0, 1, 0, -1, -1, 1, 1, -1, -2, -2, 2, 2, -1, -1, 1, 1};
const int dc[] = { 1, 0, -1, 0, 1, 1, -1, -1, -1, 1, -1, 1, -2, 2, -2, 2};
/// Constants
#define MAX 2000000
#define MOD 1000000009
#define base 1000000007
#define eps 1e-9
#define INF 1llu<<61 // 2,305,843,009,213,693,952
#define inf 1<<29 // 536,870,912
#define PI acos(-1.0) // 3.1415926535897932
int status[10000005];
vector<int>prime;
void seive(){
for(int i=4; i<10000005; i+=2) status[i]=1;
for(int i=3; i*i<=10000005; i+=2){
if(status[i]==0){
for(int j=i*i; j<10000005; j+=(i+i)){
status[j]=1;
}
}
}
for(int i=2; i<10000005; i++) if(!status[i]) prime.push_back(i);
}
int main()
{
ll n, k=0, s, p, q, d=0, t, a=0, b, c=0, m, ck=0, dk=0, g=0, aa=0;
scl(n);
while(n--){
scl(m);
ll arr[m+1][m+1];
for(int i=0; i<m; i++){
for(int j=0; j<m; j++){
cin>>arr[i][j];
}
}
c=0;
for(int i=0; i<m; i++){
for(int j=0; j<m-1; j++){
if(arr[i][j]==arr[i][j+1]){
c=1;
break;
}
}
}
cout<<(c?"No":"Yes")<<endl;
}
return 0;
}
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