View Compilation Error

0_0_38717361_8144.cpp: In function 'int check(ll)':
0_0_38717361_8144.cpp:18:26: error: 'v' was not declared in this scope
   18 |                 if(!mapp[v[i].second])
      |                          ^
0_0_38717361_8144.cpp:23:31: error: 'v' was not declared in this scope
   23 |                 while(j<=i && v[i].first-v[j].first>x)
      |                               ^