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102 kB
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#include <iostream> using namespace std; int qe[20002]; int dx[] = {-1,1,0,0}; int dy[] = {0,0,-1,1}; int head; int tail; void enqueue(int x){ tail++; qe[tail] = x; } int dequeue(){ head++; int a = qe[head]; qe[head] = 0; return a; } int main(){ freopen("input.txt","r",stdin); int T,x; cin>>T; for (x = 0; x < T; x++){ int N,M; cin>>N>>M; int A[101][101],i,j; for (i = 0; i < M; i++){ for (j = 0; j < N; j++){ cin>>A[i][j]; } } int y0,x0,max = 0; cin>>y0>>x0; head = -1; tail = -1; int check = 1; enqueue(x0-1); enqueue(y0-1); A[x0-1][y0-1] = 2; while (tail - head >=2){ int row = dequeue(); int col = dequeue(); for (i = 0; i < 4; i++){ int x1 = row + dx[i]; int y1 = col + dy[i]; if (x1 >= 0 && x1 < M && y1 >= 0 && y1 < N && A[x1][y1] == 1){ enqueue(x1); enqueue(y1); A[x1][y1] = A[row][col] + 1; } } } for (i = 0; i < M; i++){ for (j = 0; j < N; j++){ if (max < A[i][j]) max = A[i][j]; } } cout<<max-1<<endl; } return 0; } /* 10 10 10 1 1 1 1 0 1 1 0 0 0 0 1 1 1 1 1 0 1 1 0 0 0 1 1 0 1 0 1 1 1 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