View Compilation Error

0_0_13206500_9574.cpp: In function 'int main()':
0_0_13206500_9574.cpp:53:32: error: 'memset' was not declared in this scope
         memset(dp,-1,sizeof(dp));
                                ^
0_0_13206500_9574.cpp:54:27: error: 'strlen' was not declared in this scope
         int len=strlen(str);
                           ^