The angle between the vectors
Very easy
Execution time limit is 1 second
Runtime memory usage limit is 122.174 megabytes
Calculate the angle between two vectors.
Input
Four integers x[1],y[1],x[2],y[2] - the coordinates of two nonzero vectors. All values do not exceed 10000 by the absolute value.
Output
Print the value of an undirected angle between vectors with 5 decimal places in the interval [0; π].
Examples
Input #1
Answer #1
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