View Compilation Error

0_0_17241718_6816.cpp: In function 'int main()':
0_0_17241718_6816.cpp:37:25: error: 'memset' was not declared in this scope
 memset(dig,0,sizeof(dig));
                         ^
0_0_17241718_6816.cpp:48:17: error: 'N' was not declared in this scope
             dig[N+sum]++;
                 ^
0_0_17241718_6816.cpp:55:23: error: 'N' was not declared in this scope
             temp+=dig[N-sum];
                       ^