View Compilation Error

0_0_37419331_32587.cpp: In function 'void solve()':
0_0_37419331_32587.cpp:104:30: error: 'memset' was not declared in this scope
  memset(book, 0, sizeof(book));
                              ^
0_0_37419331_32587.cpp: In function 'int main()':
0_0_37419331_32587.cpp:115:27: error: 'memset' was not declared in this scope
   memset(mp, 0, sizeof(mp));
                           ^