View Compilation Error

0_0_13351956_7299.cpp: In function 'void solve()':
0_0_13351956_7299.cpp:63:28: error: 'sort' was not declared in this scope
     sort(h.begin(), h.end());
                            ^
0_0_13351956_7299.cpp:69:70: error: 'upper_bound' was not declared in this scope
         vector<int>::iterator it2 = upper_bound(h.begin(), h.end(), t);
                                                                      ^