View Compilation Error

0_0_25832048_30042.cpp: In function 'int main()':
0_0_25832048_30042.cpp:43:27: error: 'sort' was not declared in this scope
         sort(node,node+2*n);
                           ^
0_0_25832048_30042.cpp:44:34: error: 'unique' was not declared in this scope
         pp = unique(node,node+2*n)-node;
                                  ^
0_0_25832048_30042.cpp:49:34: error: 'memset' was not declared in this scope
         memset(dp,0x3f,sizeof(dp));
                                  ^