View Compilation Error

0_0_19789448_21728.cpp: In function 'int main()':
0_0_19789448_21728.cpp:34:26: error: 'memset' was not declared in this scope
   memset(dp,-1,sizeof(dp));
                          ^
0_0_19789448_21728.cpp:35:23: error: 'strlen' was not declared in this scope
   if(solve(0,strlen(s1)-1))
                       ^