View Compilation Error

0_0_15365628_22433.cpp: In function 'void dfs(int, int, int)':
0_0_15365628_22433.cpp:36:35: error: 'memset' was not declared in this scope
     memset(vis, false, sizeof(vis));
                                   ^
0_0_15365628_22433.cpp: In function 'int main()':
0_0_15365628_22433.cpp:83:33: error: 'memset' was not declared in this scope
   memset(vis, false, sizeof(vis));
                                 ^