Tag: C++
All the articles with the tag "C++".
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How to Sort a Map by Value in C++
A std::map always sorts by key, never by value. Here is the standard way to sort map entries by value in C++ using a vector of pairs, plus ties and top-N.
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How to Use a Vector of Pairs in C++
Create, fill, sort and iterate a std::vector of std::pair in C++. Sort by first or second element, use structured bindings, and know when to use a map instead.
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C++ Check if File Exists: 3 Reliable Ways (with Examples)
Updated:Learn how to check if a file exists in C++ using std::filesystem, ifstream, and fopen. Compare the three methods and see which to use, with runnable examples.
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C++ cin.ignore(): Fix getline Skipping After cin >>
Updated:Why getline is skipped after cin >> in C++, and how cin.ignore() clears the leftover newline. Fix the input buffer bug with clear, beginner-friendly examples.