View Compilation Error

0_0_26836989_14437.cpp: In function 'int get_sg(int, int)':
0_0_26836989_14437.cpp:20:29: error: 'memset' was not declared in this scope
     memset(vis,0,sizeof(vis));
                             ^
0_0_26836989_14437.cpp: In function 'int main()':
0_0_26836989_14437.cpp:41:32: error: 'memset' was not declared in this scope
         memset(sg,-1,sizeof(sg));
                                ^