Untitled

#include <iostream>
using namespace std;
int qe[80008];
int tail,head;
int dx[]={-1,1,0,0};
int dy[]={0,0,-1,1};
void enq(int a){
	tail++;
	qe[tail]= a;
}
int deq(){
	head++;
	int a = qe[head];
	qe[head] = 0;
	return a;
}
int main(){
	freopen("input.txt","r",stdin);
	int x,T;
	cin>>T;
	for (x = 0; x < T; x++){
		int N,i,dem = 0,x0,y0,check = -1;
		cin>>N;
		int j,A[200][200],B[200][200];
		for (i = 0; i < N; i++){
			for (j = 0; j < N; j++){
				cin>>A[i][j];
				B[i][j] = A[i][j];
				if (A[i][j] == 2){
					A[i][j] = 1;
					x0 = i;
					y0 = j;
				}
			}
		}
		int sum1;
		head = -1;
		tail = -1;
		enq(0);
		enq(0);
		A[0][0] = 2;
		while (tail - head >=2){
			int row = deq();
			int col = deq();
			for (int k = 0; k < 4; k++){
				int x1 = row + dx[k];
				int y1 = col + dy[k];
				if (x1>=0 && y1>=0 && x1<N && y1<N && A[x1][y1] == 1){
					enq(x1);
					enq(y1);
					A[x1][y1] = A[row][col] + 1;
				}
			}
		}
		sum1 = A[x0][y0];
		if (sum1 != 1){
			head = -1;
			tail = -1;
			enq(x0);
			enq(y0);
			B[x0][y0] = 2;
			while (tail - head >=2){
				int row = deq();
				int col = deq();
				for (int k = 0; k < 4; k++){
					int x1 = row + dx[k];
					int y1 = col + dy[k];
					if (x1>=0 && y1>=0 && x1<N && y1<N && B[x1][y1] == 1){
						enq(x1);
						enq(y1);
						B[x1][y1] = B[row][col] + 1;
					}
				}
			}
			if (B[N-1][N-1] >1){
				check = sum1 + B[N-1][N-1] - 4;
			}
		}
		cout <<check <<endl;
	}
	return 0;
}
/*
10
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