View Compilation Error

0_0_37130235_21617.cpp: In function 'void init()':
0_0_37130235_21617.cpp:10:35: error: 'memset' was not declared in this scope
     memset(first, -1, sizeof first);
                                   ^
0_0_37130235_21617.cpp: In function 'void solve(int, int, int)':
0_0_37130235_21617.cpp:48:37: error: 'memset' was not declared in this scope
     memset(linker, -1, sizeof linker);
                                     ^