This program illustrates the use of the STL remove_if() algorithm to
remove all values that are divisible by 3 from a vector of integers.
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Here are the sixteen values in the vector:
1 2 2 3 4 5 2 3 6 7 2 8 3 9 10 2
Size of vector to start:     16
Capacity of vector to start: 16
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Now we remove all 5 values that are divisble by 3.
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Size of vector immediately after the call to remove_if:     16
Capacity of vector immediately after the call to remove_if: 16
Contents of vector immediately after the call to remove_if:
1 2 2 4 5 2 7 2 8 10 2 8 3 9 10 2
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Now we erase the last five values of the vector.
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Size of vector immediately after the call to erase:     11
Capacity of vector immediately after the call to erase: 16
Contents of vector immediately after the call to erase:
1 2 2 4 5 2 7 2 8 10 2
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