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已解决
#include<iostream>
#include<cstring>
#include<string>
using namespace std;
int main()
{
int i,n;
string s;
cin>>s;
if(s[0]>='A'&&s[0]<='Z')
{
n=s.size();
for(i=1;i<=n-1;i++)
if(s[i]>='0'&&s[i]<='9'||s[i]>='A'&&s[i]<='Z'||s[i]>='a'&&s[i]<='z'||s[i]=='_')
{
}
else
{
cout<<"No"<<endl;
return 0;
}
}
else
{
cout<<"No"<<endl;
return 0;
}
cout<<"Yes"<<endl;
return 0;
}
90分
Why???
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