View Compilation Error

0_0_37384838_27034.cpp: In function 'void buildMap()':
0_0_37384838_27034.cpp:69:41: error: 'memset' was not declared in this scope
         memset(visited,0,sizeof(visited));
                                         ^
0_0_37384838_27034.cpp: In function 'int main()':
0_0_37384838_27034.cpp:124:47: error: 'memset' was not declared in this scope
         memset(mapVisited,0,sizeof(mapVisited));
                                               ^