View Compilation Error

0_0_13201207_20888.cpp: In function 'int main()':
0_0_13201207_20888.cpp:29:38: error: 'memset' was not declared in this scope
               memset(sg,-1,sizeof(sg));
                                      ^
0_0_13201207_20888.cpp:36:13: error: expected '}' at end of input
     return 0;
             ^