View Compilation Error

0_0_28946123_11578.cpp: In function 'int main()':
0_0_28946123_11578.cpp:27:24: error: 'strlen' was not declared in this scope
   int n1 = strlen(zidan);
                        ^
0_0_28946123_11578.cpp:29:27: error: 'memset' was not declared in this scope
   memset(dp, 0, sizeof(dp));
                           ^