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[0]=='3'&&id[1]=='3'){
            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;
        }

        else if(id[0]=='1'&&id[1]=='1'){
             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;
        }

        else if(id[0]=='7'&&id[1]=='1'){
             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;
        }

        else if(id[0]=='8'&&id[1]=='1'){
             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;
        }

         else if(id[0]=='8'&&id[1]=='2'){
             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;
        }

         else if(id[0]=='5'&&id[1]=='4'){
             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;
        }

         else if(id[0]=='2'&&id[1]=='1'){
             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;
        }

         else {
             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;
        }

    }
    return 0;
}

　　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(0,4);       //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=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;
}

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