View Compilation Error

0_0_36110767_25164.cpp:7:9: error: 'maxn' was not declared in this scope
 int tot[maxn];
         ^
0_0_36110767_25164.cpp: In function 'int main()':
0_0_36110767_25164.cpp:23:67: error: 'tot' was not declared in this scope
         for(int i = 0;i < (1 << n);i++)   if((i & (i >> 1)) == 0) tot[++cnt] = i;
                                                                   ^
0_0_36110767_25164.cpp:25:14: error: 'MS0' was not declared in this scope
         MS0(f);
              ^
0_0_36110767_25164.cpp:28:34: error: 'tot' was not declared in this scope
                 int val = calc(i,tot[k]);
                                  ^