View Compilation Error

0_0_14604530_23376.cpp:7:8: error: 'N' was not declared in this scope
 bool a[N][N] = {false};
        ^
0_0_14604530_23376.cpp:7:11: error: 'N' was not declared in this scope
 bool a[N][N] = {false};
           ^
0_0_14604530_23376.cpp: In function 'int main()':
0_0_14604530_23376.cpp:34:7: error: 'a' was not declared in this scope
    if(a[x][y] == false){
       ^