View Compilation Error

0_0_16605189_22628.cpp: In function 'int main()':
0_0_16605189_22628.cpp:59:13: error: 'v' was not declared in this scope
             v[i].clear();
             ^
0_0_16605189_22628.cpp:67:17: error: 'v' was not declared in this scope
                 v[i].push_back(x);
                 ^