View Compilation Error

0_0_35600778_8012.cpp: In function 'void pre()':
0_0_35600778_8012.cpp:44:29: error: 'memset' was not declared in this scope
  memset(cnt , 0 , sizeof cnt);
                             ^
0_0_35600778_8012.cpp: In function 'void solve()':
0_0_35600778_8012.cpp:68:4: error: 'ans' was not declared in this scope
    ans += 
    ^
0_0_35600778_8012.cpp:69:3: error: expected primary-expression before '}' token
   }
   ^