View Compilation Error

0_0_39564736_19135.cpp: In function 'void solve()':
0_0_39564736_19135.cpp:10:25: error: 'n' was not declared in this scope
   10 |     for (int i = 0; i < n; i++)
      |                         ^
0_0_39564736_19135.cpp:20:13: error: 'n' was not declared in this scope
   20 |     cout << n - (c[1] + c[2] + 1) / 2 << '\n';
      |             ^