#include<bits/stdc++.h>
using namespace std;
int main(){
    string s;
    cin>>s;
    cout<<s.size();
    return 0;
}
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实现strlen函数

简单

#include<bits/stdc++.h>
using namespace std;
int main(){
string s;
cin>>s;
cout<<s.size();
return 0;
}
