View Compilation Error

315922_0_22757.cpp:10: error: field `str' has incomplete type
315922_0_22757.cpp: In member function `bool inf::go(char)':
315922_0_22757.cpp:18: error: invalid types `int[int]' for array subscript
315922_0_22757.cpp: In function `int main()':
315922_0_22757.cpp:57: error: `mark1' undeclared (first use this function)
315922_0_22757.cpp:57: error: (Each undeclared identifier is reported only once for each function it appears in.)
315922_0_22757.cpp:64: error: 'struct inf' has no member named 'str'
315922_0_22757.cpp:65: error: 'struct inf' has no member named 'str'
315922_0_22757.cpp:66: error: 'struct inf' has no member named 'str'
315922_0_22757.cpp:67: error: 'struct inf' has no member named 'str'
315922_0_22757.cpp:68: error: 'struct inf' has no member named 'str'
315922_0_22757.cpp:69: error: 'struct inf' has no member named 'str'
315922_0_22757.cpp:74: error: 'struct inf' has no member named 'str'