1470: 合法C标识符查
Memory Limit：128 MB
Time Limit：1.000 S
Judge Style：Text Compare
Creator：
Submit：31
Solved：8
Description
C语言标识符要求：
1.非保留字；（本题）
2.只包含字母、数字及下划线（“_”）。
3.不以数字开头。
这里保留字以下面这些关键字为准
1.非保留字；（本题）
2.只包含字母、数字及下划线（“_”）。
3.不以数字开头。
这里保留字以下面这些关键字为准
asm、auto、bool、break、case、catch、char、class、const、const_cast、continue、default、delete、do、double、dynamic_cast、else、enum、explicit、export、extern、false、float、for、friend、goto、if、inline、int、long、mutable、namespace、new、operator、private、protected、public、register、reinterpret_cast、return、short、signed、sizeof、static、static_cast、struct、switch、template、this、throw、true、try、typedef、typeid、typename、union、unsigned、using、virtual、void、volatile、wchar_t、while
Input
一行，包含一个字符串，字符串中不包含任何空白字符，且长度不大于20。
Output
一行，如果它是C语言的合法标识符，则输出yes，否则输出no。
Sample Input Copy
RKPEGX9R;TWyYcpSample Output Copy
noHINT
这里可以保留字存在一个string类型的数组里。
string key_arr[63]={"asm","auto","bool","break","case","catch","char","class","const","const_cast","continue","default","delete","do","double","dynamic_cast","else","enum","explicit","export","extern","false","float","for","friend","goto","if","inline","int","long","mutable","namespace","new","operator","private","protected","public","register","reinterpret_cast","return","short","signed","sizeof","static","static_cast","struct","switch","template","this","throw","true","try","typedef","typeid","typename","union","unsigned","using","virtual","void","volatile","wchar_t","while"};
string key_arr[63]={"asm","auto","bool","break","case","catch","char","class","const","const_cast","continue","default","delete","do","double","dynamic_cast","else","enum","explicit","export","extern","false","float","for","friend","goto","if","inline","int","long","mutable","namespace","new","operator","private","protected","public","register","reinterpret_cast","return","short","signed","sizeof","static","static_cast","struct","switch","template","this","throw","true","try","typedef","typeid","typename","union","unsigned","using","virtual","void","volatile","wchar_t","while"};