View Compilation Error

0_0_4434262_5525.cpp: In function `int main()':
0_0_4434262_5525.cpp:56: error: `Statistic' undeclared (first use this function)
0_0_4434262_5525.cpp:56: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_4434262_5525.cpp:57: error: `Sub' undeclared (first use this function)
0_0_4434262_5525.cpp:57: error: expected `;' before "c"