我用C++寫的，在Codeblocks上運行，輸入兩次問題，都可得到正確解

但系統顯示出以下訊息：

WA (line:2)
答案不正確

您的答案為: no 正確答案為: yes 

想請教大家，程式的哪一個地方出問題了，謝謝。

---------------------以下為程式碼------------------- 

#include <iostream>
#define max 9
#define ans 405
using namespace std;

int w=0,x=0,y=0,z=0;
int w1=0,x1=0,y1=0,z1=0;
int N1[10]={0},N2[10]={0};
int num1=0,num2=0;
int answer=1,answer1=1,answer2=1;
int i=0,j=0;
char m[10][10];
int n[10][10];
int CtN(char ch); //字串轉數字

int main()
{
    //input the matrix
    while(cin.peek()){
        N1[num1]=0,N2[num2]=0; //清除陣列中加總的值

     //輸入九宮格
    for(w=0;w<max;w++){
        for(x=0;x<max;x++){
            cin >> m[w][x]; 
            n[w][x] = CtN(m[w][x]);
        }
    }
    //sum
    for(w1=0;w1<max;w1++){
        for(x1=0;x1<max;x1++){
            N1[num1]+= n[w1][x1];
            N2[num2]+= n[x1][w1];
        }
    }
    //judge the sum is correct
            if(N1[num1]!=ans){
                cout << "N1[num1]" << N1[num1] << endl;
                //num1++;
                answer = 0;
                break;
            }
            else{
               answer = 1;
            }
            if(N2[num2]!=ans){
                cout << "N2[num2]" << N2[num2] << endl;
                //num2++;
                answer1 = 0;
                break;
            }
            else{
                answer1 = 1;
            }
            i=0;

        while ( i < 9 ){
                 j = 0;
            while ( j < 9 ) {
                if( ( n[i][j] + n[i+1][j] + n[i+2][j] + n[i][j+1] + n[i+1][j+1] + n[i+2][j+1] +
                     n[i][j+2] + n[i+1][j+2] + n[i+2][j+2] ) != 45 ){
                        answer2 = 0;
                        break;
                }
                j += 3;
            }
                i += 3;
        }

    if(answer == 0 || answer1 == 0 || answer2 == 0){
        cout << "no" << endl;

    }
    else cout << "yes" << endl;

    }
    return 0;
}

int CtN(char ch)
{
    int num;
    num = int(ch)-48;
    //cout << "num = " << num << endl;
    return num;
}