View Compilation Error

0_0_25626575_28353.cpp: In function 'void compress_process()':
0_0_25626575_28353.cpp:38:52: error: 'sort' was not declared in this scope
         sort(compress[i].begin(), compress[i].end());
                                                    ^
0_0_25626575_28353.cpp: In function 'void dfs3(int, int)':
0_0_25626575_28353.cpp:97:69: error: 'upper_bound' was not declared in this scope
         int v=upper_bound(g[u].begin(), g[u].end(), b[last_position]) - g[u].begin() - 1;
                                                                     ^
0_0_25626575_28353.cpp: In function 'int main()':
0_0_25626575_28353.cpp:141:60: error: 'sort' was not declared in this scope
         for(int i=1;i<=n;i++) sort(g[i].begin(), g[i].end());
                                                            ^