what is using namespace std in cpp

经实验验证修正对usingnamespacestd的认识

cpp #include iostream> using namespace std; int main() { cout

h>usingnamespacestd;classstring{public:string(constchar*str){if

algorithm>using namespace std;bool isfriend(string a, string b)

cpp#include iostream>usingnamespacestd;#include"person.

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