This program illustrates the use of the STL replace_if() algorithm to
replace all copies of a given value in a vector of integers that satisfy
a given predicate with another value.
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Here are the values in the vector:
1 2 2 3 4 5 2 6
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Now we replace all values divisble by 3 with 123.
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Here are the revised contents of the vector:
1 2 2 123 4 5 2 123
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