USACO chapter 1 section 1.2 Palindromic Squares

USACO chapter 1 section 1.2 Palindromic Squares

USER: tianbing tianbing [tbbd4261]
TASK: palsquare
LANG: C++
Compiling...
Compile: OK
Executing...
Test 1: TEST OK [0.000 secs, 2928 KB]
Test 2: TEST OK [0.000 secs, 2928 KB]
Test 3: TEST OK [0.011 secs, 2928 KB]
Test 4: TEST OK [0.022 secs, 2928 KB]
Test 5: TEST OK [0.011 secs, 2928 KB]
Test 6: TEST OK [0.011 secs, 2928 KB]
Test 7: TEST OK [0.011 secs, 2928 KB]
Test 8: TEST OK [0.011 secs, 2928 KB]
All tests OK.
Your program ('palsquare') produced all correct answers!  This is your
submission #3 for this problem.  Congratulations!

Here are the test data inputs:

------- test 1 -------
10
------- test 2 -------
2
------- test 3 -------
5
------- test 4 -------
11
------- test 5 -------
15
------- test 6 -------
18
------- test 7 -------
20
------- test 8 -------
3

Keep up the good work!

Thanks for your submission!

代码：
WA了两次，第一次B>=10的话没有转变成对应的字母，第二次忘了换成文件 加油！

 1 /**/ /*
 2ID:tbbd4261
 3LANG:C++
 4PROG:palsquare
 5*/
 6 #include < iostream >
 7 #include < algorithm >
 8 #include < string >
 9 #include < vector >
10 #include < fstream >
11 using   namespace  std;
12 string   pal( int  n, int   base , bool   & flag)
13 {
14     string str="";
15     while(n)
16     {
17       str+=(n%base>=10)?n%base-10+'A':n%base+'0';
18       n=n/base;
19     }
20     for(int i=0,j=str.size()-1; i<str.size()/2;i++,j--)
21     if(str[i]!=str[j]){ flag=0; break;}
22     reverse(str.begin(),str.end());
23     return str;
24}
25 string  turn( int  n, int   base )
26 {
27    string str="";
28     while(n)
29     {
30       str+=(n%base>=10)?n%base-10+'A':n%base+'0';
31       n=n/base;
32     }
33     reverse(str.begin(),str.end());
34    return str;
35}
36 int  main()
37 {
38    ifstream fin("palsquare.in");
39    ofstream fout("palsquare.out");
40    int base,i;  string str;
41    fin>>base;
42    for(i=1; i<=300; i++)
43    {
44      bool flag=1;
45      string s1=turn(i,base);
46      string s2=pal(i*i,base,flag);
47      if(flag) { fout<<s1<<' '<<s2<<endl; }
48    }
49    
50    //system("pause");    
51    return 0;
52}
53