View Compilation Error

0_0_36597890_25547.cpp: In function 'int main()':
0_0_36597890_25547.cpp:18:35: error: 'memset' was not declared in this scope
         memset(dp,-0x3f,sizeof(dp));
                                   ^
0_0_36597890_25547.cpp:29:33: error: 'sort' was not declared in this scope
                 sort(b,b+tot,cmp);
                                 ^