问题标题: 酷町堂：1088 0分

代码：

#include<iostream>
#include<string>
#include<cmath>
using namespace std;
int main(){
    string a;
    getline(cin,a);
    for(int i=0;i<=a.size()-1;i++){
        if(i==0){
            if(a[i]>=65&&a[i]<=90){
                continue;
            }
            if(a[i]>=97&&a[i]<=122){
                cout<<"No";
                break;
            }
            if(a[i]>=48&&a[i]<=57){
                cout<<"Mo";
                break;
            }
            else{
                continue;
            }
        }
        if(i!=0&&i!=a.size()-1){
            if(a[i]>=48&&a[i]<=57){
                continue;
            }
            if(a[i]>=65&&a[i]<=90){
                continue;
            }
            if(a[i]>=97&&a[i]<=122){
                continue;
            }
            if(a[i]=='_'){
                continue;
            }
            else{
                cout<<"No";
                break;
            }
        }
        if(i==a.size()-1){
            if(a[i]>=48&&a[i]<=57){
                cout<<"Yes";
            }
            if(a[i]>=65&&a[i]<=90){
                cout<<"Yes";
            }
            if(a[i]>=97&&a[i]<=122){
                cout<<"Yes";
            }
            if(a[i]=='_'){
                cout<<"Yes";
            }
            else{
                cout<<"No";
            }
        }
    }
}

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