View Compilation Error

0_0_21999159_29031.cpp: In function 'bool searchPath()':
0_0_21999159_29031.cpp:27:25: error: 'memset' was not declared in this scope
  memset(dx,-1,sizeof(dx));
                         ^
0_0_21999159_29031.cpp: In function 'int maxmatch()':
0_0_21999159_29031.cpp:83:25: error: 'memset' was not declared in this scope
  memset(Mx,-1,sizeof(Mx));
                         ^
0_0_21999159_29031.cpp: In function 'int main()':
0_0_21999159_29031.cpp:108:23: error: 'memset' was not declared in this scope
   memset(g,0,sizeof(g));
                       ^