View Compilation Error

0_0_13845396_17993.cpp:19:11: error: 'maxn' was not declared in this scope
 int field[maxn][maxn];
           ^
0_0_13845396_17993.cpp:19:17: error: 'maxn' was not declared in this scope
 int field[maxn][maxn];
                 ^
0_0_13845396_17993.cpp: In function 'int main()':
0_0_13845396_17993.cpp:78:28: error: 'field' was not declared in this scope
                scanf("%d",&field[j][k]);
                            ^