View Compilation Error

0_0_19863854_16976.cpp: In function 'int main()':
0_0_19863854_16976.cpp:41:44: error: 'memset' was not declared in this scope
            memset ( com, 0, sizeof ( com ) ); sum = 0;
                                            ^
0_0_19863854_16976.cpp:53:62: error: expected ';' before 'sum'
                                              num[x] > temp   sum -- : num[x] == temp  : sum++ ; x ++; 
                                                              ^