杭电2629 Identity Card

　　题目意思很简单，就是根据身份证号码来确定一个人的籍贯和生日，（然而我开始脑子抽了还以为还要根据奇数偶数判断男女233333）。

　　然后我的暴力ac代码：

　　

 #include <iostream>
 #include<math.h>
 #include <iomanip>
 #include<cstdio>
 #include<string>
 #include<map>
 #include<vector>
 #include<algorithm>
 #include<stdlib.h>
 using namespace std;

 int main()
 {
     int n;
     string id;
     cin>>n;

     while(n--){
         cin>>id;
         if(id[]==''&&id[]==''){
             cout<<"He/She is from Zhejiang,and his/her birthday is on "<<id[]<<id[]<<","<<id[]<<id[]<<","<<id[]<<id[]<<id[]<<id[]<<" based on the table."<<endl;
         }

         else if(id[]==''&&id[]==''){
              cout<<"He/She is from Beijing,and his/her birthday is on "<<id[]<<id[]<<","<<id[]<<id[]<<","<<id[]<<id[]<<id[]<<id[]<<" based on the table."<<endl;
         }

         else if(id[]==''&&id[]==''){
              cout<<"He/She is from Taiwan,and his/her birthday is on "<<id[]<<id[]<<","<<id[]<<id[]<<","<<id[]<<id[]<<id[]<<id[]<<" based on the table."<<endl;
         }

         else if(id[]==''&&id[]==''){
              cout<<"He/She is from Hong Kong,and his/her birthday is on "<<id[]<<id[]<<","<<id[]<<id[]<<","<<id[]<<id[]<<id[]<<id[]<<" based on the table."<<endl;
         }

          else if(id[]==''&&id[]==''){
              cout<<"He/She is from Macao,and his/her birthday is on "<<id[]<<id[]<<","<<id[]<<id[]<<","<<id[]<<id[]<<id[]<<id[]<<" based on the table."<<endl;
         }

          else if(id[]==''&&id[]==''){
              cout<<"He/She is from Tibet,and his/her birthday is on "<<id[]<<id[]<<","<<id[]<<id[]<<","<<id[]<<id[]<<id[]<<id[]<<" based on the table."<<endl;
         }

          else if(id[]==''&&id[]==''){
              cout<<"He/She is from Liaoning,and his/her birthday is on "<<id[]<<id[]<<","<<id[]<<id[]<<","<<id[]<<id[]<<id[]<<id[]<<" based on the table."<<endl;
         }

          else {
              cout<<"He/She is from Shanghai,and his/her birthday is on "<<id[]<<id[]<<","<<id[]<<id[]<<","<<id[]<<id[]<<id[]<<id[]<<" based on the table."<<endl;
         }

     }
     return ;
 }

　　想表示下，我开始并没有顺利ac因为，我最后一行的输出多了一个空格，233333.

　　然后就去看了下别人的代码，于是想补充下字符串的一些知识：

　　一个截取字符串的函数substr()，觉得比较方便，该函数的用法见下面一个示例代码，一看便知：

#include<string>
#include<iostream>
using namespace std;
main()
{
string s("12345asdf");
string a=s.substr(,);       //获得字符串s中 从第0位开始的长度为4的字符串
cout<<a<<endl;
}

ac代码：

#include <iostream>
#include<string>

using namespace std;

int main(void)
{
    int n;
    string input_str,place;
    cin>>n;
    for(int i=; i<n; i++)
    {
        cin>>input_str;
        if(input_str.substr(,)=="")
            place="Zhejiang";
        else if(input_str.substr(,)=="")
            place="Beijing";
        else if(input_str.substr(,)=="")
            place="Taiwan";
        else if(input_str.substr(,)=="")
            place="Hong Kong";
        else if(input_str.substr(,)=="")
            place="Macao";
        else if(input_str.substr(,)=="")
            place="Tibet";
        else if(input_str.substr(,)=="")
            place="Liaoning";
        else if(input_str.substr(,)=="")
            place="Shanghai";

        cout <<"He/She is from"<<" "<< place
             << ",and his/her birthday is on"<<" "<<input_str.substr(,)<<","
             <<input_str.substr(,)<<","<<input_str.substr(,)<<" "
             <<"based on the table."<<endl;
    }

    return ;
}

补充部分来自：http://blog.csdn.net/always2015/article/details/45391791