View Compilation Error

0_0_22037198_25070.cpp: In function 'void spfa()':
0_0_22037198_25070.cpp:60:40: error: 'memset' was not declared in this scope
  memset(visited, false, sizeof(visited));
                                        ^
0_0_22037198_25070.cpp: In function 'bool process(long long int&)':
0_0_22037198_25070.cpp:128:35: error: 'memset' was not declared in this scope
  memset(known, true, sizeof(known));
                                   ^
0_0_22037198_25070.cpp: In function 'void spfa_1()':
0_0_22037198_25070.cpp:164:40: error: 'memset' was not declared in this scope
  memset(visited, false, sizeof(visited));
                                        ^