題目意思很簡單，就是根據身份證號碼來確定一個人的籍貫和生日，（然而我開始腦子抽了還以為還要根據奇數偶數判斷男女233333）。

　　然後我的暴力ac代碼：

 1 #include <iostream>
 2 #include<math.h>
 3 #include <iomanip>
 4 #include<cstdio>
 5 #include<string>
 6 #include<map>
 7 #include<vector>
 8 #include<algorithm>
 9 #include<stdlib.h>
10
 
 using namespace std;
11 
12 
13 
14 int main()
15 {
16     int n;
17     string id;
18     cin>>n;
19 
20     while(n--){
21         cin>>id;
22         if(id[0]==‘3‘&&id[1]==‘3‘){
23             cout<<"He/She is from Zhejiang,and his/her birthday is on "<<id[10]<<id[11
 
]<<","<<id[12]<<id[13]<<","<<id[6]<<id[7]<<id[8]<<id[9]<<" based on the table."<<endl;
24         }
25 
26         else if(id[0]==‘1‘&&id[1]==‘1‘){
27              cout<<"He/She is from Beijing,and his/her birthday is on "<<id[10
 
]<<id[11]<<","<<id[12]<<id[13]<<","<<id[6]<<id[7]<<id[8]<<id[9]<<" based on the table."<<endl;
28         }
29 
30         else if(id[0]==‘7‘&&id[1]==‘1‘){
31              cout<<"He/She is from Taiwan,and his/her birthday is on "<<id[10]<<id[11]<<","<<id[12]<<id[13]<<","<<id[6]<<id[7]<<id[8]<<id[9]<<" based on the table."<<endl;
32         }
33 
34         else if(id[0]==‘8‘&&id[1]==‘1‘){
35              cout<<"He/She is from Hong Kong,and his/her birthday is on "<<id[10]<<id[11]<<","<<id[12]<<id[13]<<","<<id[6]<<id[7]<<id[8]<<id[9]<<" based on the table."<<endl;
36         }
37 
38          else if(id[0]==‘8‘&&id[1]==‘2‘){
39              cout<<"He/She is from Macao,and his/her birthday is on "<<id[10]<<id[11]<<","<<id[12]<<id[13]<<","<<id[6]<<id[7]<<id[8]<<id[9]<<" based on the table."<<endl;
40         }
41 
42          else if(id[0]==‘5‘&&id[1]==‘4‘){
43              cout<<"He/She is from Tibet,and his/her birthday is on "<<id[10]<<id[11]<<","<<id[12]<<id[13]<<","<<id[6]<<id[7]<<id[8]<<id[9]<<" based on the table."<<endl;
44         }
45 
46          else if(id[0]==‘2‘&&id[1]==‘1‘){
47              cout<<"He/She is from Liaoning,and his/her birthday is on "<<id[10]<<id[11]<<","<<id[12]<<id[13]<<","<<id[6]<<id[7]<<id[8]<<id[9]<<" based on the table."<<endl;
48         }
49 
50          else {
51              cout<<"He/She is from Shanghai,and his/her birthday is on "<<id[10]<<id[11]<<","<<id[12]<<id[13]<<","<<id[6]<<id[7]<<id[8]<<id[9]<<" based on the table."<<endl;
52         }
53 
54     }
55     return 0;
56 }

　　想表示下，我開始並沒有順利ac因為，我最後一行的輸出多了一個空格，233333.

　　然後就去看了下別人的代碼，於是想補充下字符串的一些知識：

　　一個截取字符串的函數substr()，覺得比較方便，該函數的用法見下面一個示例代碼，一看便知：

#include<string>
#include<iostream>
using namespace std;
main()
{
string s("12345asdf");
string a=s.substr(0,4);       //獲得字符串s中 從第0位開始的長度為4的字符串
cout<<a<<endl;
}

ac代碼：

#include <iostream>
#include<string>

using namespace std;

int main(void)
{
    int n;
    string input_str,place;
    cin>>n;
    for(int i=0; i<n; i++)
    {
        cin>>input_str;
        if(input_str.substr(0,2)=="33")
            place="Zhejiang";
        else if(input_str.substr(0,2)=="11")
            place="Beijing";
        else if(input_str.substr(0,2)=="71")
            place="Taiwan";
        else if(input_str.substr(0,2)=="81")
            place="Hong Kong";
        else if(input_str.substr(0,2)=="82")
            place="Macao";
        else if(input_str.substr(0,2)=="54")
            place="Tibet";
        else if(input_str.substr(0,2)=="21")
            place="Liaoning";
        else if(input_str.substr(0,2)=="31")
            place="Shanghai";

        cout <<"He/She is from"<<" "<< place
             << ",and his/her birthday is on"<<" "<<input_str.substr(10,2)<<","
             <<input_str.substr(12,2)<<","<<input_str.substr(6,4)<<" "
             <<"based on the table."<<endl;
    }

    return 0;
}

補充部分來自：http://blog.csdn.net/always2015/article/details/45391791

杭電2629 Identity Card