Menu
I'm using map in C++. Suppose I have 10 values in the map and I want only the first one. How do I get it?
Thanks.
857
To get the first element of a Map , use destructuring assignment, e.g. const [firstKey] = map. keys() and const [firstValue] = map. values() . The keys() and values() methods return an iterator object that contains the Map's keys and values.
The unordered_map::begin() is a built-in function in C++ STL which returns an iterator pointing to the first element in the unordered_map container or in any of its bucket.
Search by value in a Map in C++ Given a set of N pairs as a (key, value) pairs in a map and an integer K, the task is to find all the keys mapped to the give value K. If there is no key value mapped to K then print “-1”. Explanation: The 3 key value that is mapped to value 3 are 1, 2, 10.
A map will not keep insertion order. Use *(myMap.begin()) to get the value of the first pair (the one with the smallest key when ordered).
You could also do myMap.begin()->first to get the key and myMap.begin()->second to get the value.
140
As simple as:
your_map.begin()->first // key your_map.begin()->second // value If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
