华为笔试题：坐标移动

#include<string>
#include<iostream>
#include<algorithm>
#include<vector>
#include<set>
#include<functional>
using namespace std;
 
bool Valid(string A)
{
    if(A[0] == 'A' || A[0] == 'D' || A[0] == 'W' || A[0] == 'S')
    {
        if( A.length() <= 3 && A.length() >= 2 )
        {
            if(A.length() == 2)
            {
                if( A[1] <= '9' && A[1] >= '0' ) return true;
                else return false;
            }
             
            else
            {
                if( A[1] <= '9' && A[1] >= '0' && A[2] <= '9' && A[2] >= '0' ) return true;
                else return false;
            }
        }
         
        else return false;
         
    }
    else return false;
}
 
 
string MovePos(string A)
{
    int len = A.length(), x_axis = 0, y_axis = 0; 
    for(int i = 0; i < len;i++)
    {
        string tmp;  
        while(  A[i] != ';' )
        {
            tmp += A[i];
            i++;
        }
       if( Valid(tmp) )
       {
          if(tmp[0] == 'A' || tmp[0] == 'D') 
          {
               
              if(tmp.length() == 3)
              {
                  int offset = (tmp[1]-'0')*10 + (tmp[2]-'0');
                  tmp[0] == 'A' ? x_axis -= offset :  x_axis += offset;
              }
              else
              {
                  int offset = (tmp[1]-'0');
                  tmp[0] == 'A' ? x_axis -= offset :  x_axis += offset;
              }
          }
          else
          {
               if(tmp.length() == 3)
              {
                  int offset = (tmp[1]-'0')*10 + (tmp[2]-'0');
                  tmp[0] == 'S' ? y_axis -= offset :  y_axis += offset;
              }
              else
              {
                  int offset = (tmp[1]-'0');
                  tmp[0] == 'S' ? y_axis -= offset :  y_axis += offset;
              }            
          }      
       }                    
   }
     
    string res;
    res += to_string(x_axis);
    res += ',';
    res += to_string(y_axis);
    return  res;
}
 
 
int main()
{
    string n;
    while(cin>>n)
    {
    
    cout<<MovePos(n)<<endl;
    }
    return 0;
}