View Compilation Error

0_0_23594401_8884.cpp: In function 'int main()':
0_0_23594401_8884.cpp:30:25: error: 'j' was not declared in this scope
   f[i][10]+=maxn(f[i+1][j],f[i+1][j-1]);
                         ^
0_0_23594401_8884.cpp:30:39: error: 'maxn' was not declared in this scope
   f[i][10]+=maxn(f[i+1][j],f[i+1][j-1]);
                                       ^