View Compilation Error

0_0_13653879_24121.cpp: In function 'int main()':
0_0_13653879_24121.cpp:31:53: error: 'memset' was not declared in this scope
             memset(Stus[i].off,0,sizeof(Stus[i].off));
                                                     ^
0_0_13653879_24121.cpp:47:41: error: 'memset' was not declared in this scope
             memset(cango,0,sizeof(cango));
                                         ^