Finding duplicate in 2D Vector string

I want to find that whether the 2d Vector table having duplicate or not. I can see lot of programs for removing duplicates by using unique STL algorithm. Which is the best way to find " is Duplicate or not " for 100,000 Records.
If you want to avoid having duplicate entries in your STL container, then use a container that won't allow duplicates, e.g. std::map
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