Why this gets WA1?

//---------------------------------------------------------------------------
#include <iostream.h>
#include <memory.h>
int main()
{
        bool mas[30][30];
        for (int i=0; i<30; ++i)
        for (int j=0; j<30; ++j)
        {
                mas[i][j]=false;
        }
        int n;
        char ch,ch1,ch2;
        cin>>n;
        for (int i=0; i<n; ++i)
        {
                cin>>ch1>>ch2;
                mas[ch1-'a'][ch2-'a']=true;
        }
        cin>>ch;
        for (int i=0; i<30; ++i)
        {
                if (mas[ch-'a'][i])
                {
                        cout<<ch<<(char)(i+'a')<<endl;
                }
        }
        cin>>ch;
        return 0;
}
//---------------------------------------------------------------------------

//what about RC/LF ?
//for example
//there is a text text file which contents some symbols
ab
ac
ba

//but on your hard disk drive it is look as ( in hexadimal )
"61620D0A61630D0A62661"
//0D0A it is an linefeed in windows
//and when you are read as cin >> ch1;
//you read all characters from input file include these symbols;
//instead of cin >> x >> y ( when x and y have type "char")
//you must to use

char s[10];
cin.getline(s,10);
x = s[0]; y = s[1];

//or
char s[10];
scanf("%s", s);
x = s[0]; y = s[1];
or
scanf("%c%c\n",&x,&y);

It does not work(((

Can u mail me your solution to diablo_@list.ru?

谁有测试数据（chinese）