View Compilation Error

0_0_35670636_3298.cpp: In function 'void ChangeOneModel(int)':
0_0_35670636_3298.cpp:18:3: error: 'c' was not declared in this scope
   c[id][a[i]]--;
   ^
0_0_35670636_3298.cpp: In function 'void Modify(int, int, int)':
0_0_35670636_3298.cpp:31:4: error: 'c' was not declared in this scope
    c[sx][a[i]]--; 
    ^
0_0_35670636_3298.cpp:38:3: error: 'c' was not declared in this scope
   c[sx][a[i]]--;
   ^
0_0_35670636_3298.cpp:43:3: error: 'c' was not declared in this scope
   c[sy][a[i]]--;
   ^
0_0_35670636_3298.cpp: In function 'int query(int, int, int)':
0_0_35670636_3298.cpp:64:15: error: 'c' was not declared in this scope
   else res += c[i][co];
               ^