View Compilation Error

0_0_21332815_26885.cpp: In function 'void findnum(int*, int, int*)':
0_0_21332815_26885.cpp:15:33: error: 'memset' was not declared in this scope
     memset(vis,false,sizeof(vis));
                                 ^
0_0_21332815_26885.cpp: In function 'int main()':
0_0_21332815_26885.cpp:38:35: error: 'memset' was not declared in this scope
         memset(numa,0,sizeof(numa));
                                   ^