View Compilation Error

0_0_18088523_17902.cpp: In function 'void dfs(int, int)':
0_0_18088523_17902.cpp:126:58: error: 'memset' was not declared in this scope
                         memset(visedge, 0, sizeof visedge);
                                                          ^
0_0_18088523_17902.cpp:138:58: error: 'memset' was not declared in this scope
                         memset(visedge, 0, sizeof visedge);
                                                          ^