View Compilation Error

0_0_14035269_20815.cpp: In function 'int main()':
0_0_14035269_20815.cpp:18:25: error: 'memset' was not declared in this scope
   memset(dp,0,sizeof(dp)); 
                         ^
0_0_14035269_20815.cpp:19:13: error: 'strlen' was not declared in this scope
   n=strlen(a);
             ^