View Compilation Error

0_0_36955586_25675.cpp: In function 'void solve()':
0_0_36955586_25675.cpp:43:29: error: 'x' was not declared in this scope
  for(int i=1;i<=n;i++) head[x]=0;
                             ^
0_0_36955586_25675.cpp:44:28: error: 'x' was not declared in this scope
  for(int i=1;i<=n;i++) vis[x]=0;
                            ^
0_0_36955586_25675.cpp:45:26: error: 'x' was not declared in this scope
  for(int i=1;i<=n;i++) f[x]=0;
                          ^
0_0_36955586_25675.cpp:46:28: error: 'x' was not declared in this scope
  for(int i=1;i<=n;i++) del[x]=0;
                            ^