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Calculate network signal
Wide search array of knowledge points
Time limit: 1s Space limit: 256MB Limited language: unlimited
Title description:
The network signal will attenuate layer by layer after transmission, and it cannot directly penetrate through obstacles. In this case, it is necessary to calculate the value of the network signal at a certain location. Note: The network signal can bypass the barrier.
The two-dimensional array of array[m][n] represents the grid map,
array[i][j]=0 means that row i and column j are empty positions; array[i][j] =x (x is a positive integer) means row i and column j are signal sources, and the signal strength is x; array[i][j]=-1 means row i and column j are barriers.
There is only 1 signal source, and there may be 0 or more barriers