View Compilation Error

0_0_14865940_32037.cpp: In function 'void tmj(int)':
0_0_14865940_32037.cpp:15:27: error: 'memset' was not declared in this scope
     memset(tt,0,sizeof(tt));
                           ^
0_0_14865940_32037.cpp: In function 'int main()':
0_0_14865940_32037.cpp:54:29: error: 'memset' was not declared in this scope
         memset(t,0,sizeof(t));
                             ^
0_0_14865940_32037.cpp:58:25: error: 'strlen' was not declared in this scope
         int l = strlen(s);
                         ^