/C++/How to change the value of a key in hashmp in c++

How to change the value of a key in hashmp in c++

std::map<char, int> m;
m.insert(std::make_pair('c', 0));  // c is for cookie

std::map<char, int>::iterator it = m.find('c'); 
if (it != m.end())
    it->second = 42;

Source: stackoverflow.com

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