View Compilation Error

0_0_36649549_15145.cpp:19:7: error: 'maxn' was not declared in this scope
 int f[maxn];
       ^
0_0_36649549_15145.cpp: In function 'int main()':
0_0_36649549_15145.cpp:24:9: error: 'f' was not declared in this scope
  memset(f,INF,sizeof(f));
         ^