View Compilation Error

0_0_37829912_29432.cpp: In function 'void Func(long long int)':
0_0_37829912_29432.cpp:75:26: error: 'reverse' was not declared in this scope
  reverse(arr+1, arr+1+tot);
                          ^
0_0_37829912_29432.cpp: In function 'void Sol()':
0_0_37829912_29432.cpp:84:33: error: 'memset' was not declared in this scope
   memset(vis, false, sizeof(vis));
                                 ^
0_0_37829912_29432.cpp:96:33: error: 'memset' was not declared in this scope
   memset(vis, false, sizeof(vis));
                                 ^