View Compilation Error

0_0_14681252_24857.cpp: In function 'int check()':
0_0_14681252_24857.cpp:12:27: error: 'memset' was not declared in this scope
   memset(vis,0,sizeof(vis));
                           ^
0_0_14681252_24857.cpp:27:27: error: 'memset' was not declared in this scope
   memset(vis,0,sizeof(vis));
                           ^