View Compilation Error

0_0_28349372_2710.cpp: In function 'int find(int)':
0_0_28349372_2710.cpp:22:2: error: 'i' was not declared in this scope
  i = 0;
  ^
0_0_28349372_2710.cpp: In function 'int main()':
0_0_28349372_2710.cpp:66:27: error: 'memset' was not declared in this scope
   memset(res,0,sizeof(res));
                           ^