View Compilation Error

0_0_23985823_5576.cpp: In function 'int main()':
0_0_23985823_5576.cpp:65:17: error: 'v' was not declared in this scope
                 v.push_back(x);
                 ^
0_0_23985823_5576.cpp:69:14: error: 'v' was not declared in this scope
         sort(v.begin(), v.end()), v.erase(unique(v.begin(), v.end()), v.end());
              ^