View Compilation Error

0_0_11653400_14633.cpp:27: error: `MAXN' was not declared in this scope
0_0_11653400_14633.cpp: In function `int main()':
0_0_11653400_14633.cpp:35: error: `str' undeclared (first use this function)
0_0_11653400_14633.cpp:35: error: (Each undeclared identifier is reported only once for each function it appears in.)