This program illustrates the use of the STL replace() algorithm to replace
all copies of a given value from a vector of integers with another value.
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Here are the values in the vector:
1 2 2 3 4 5 2 3
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Now we replace all copies of the value 2 with 222.
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Here are the revised contents of the vector:
1 222 222 3 4 5 222 3
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