View Compilation Error

0_0_39674744_32212.cpp: In function 'void solve()':
0_0_39674744_32212.cpp:26:19: error: 'n' was not declared in this scope
   26 |     while (cin >> n && n) {
      |                   ^
0_0_39674744_32212.cpp:33:20: error: 'm' was not declared in this scope
   33 |             cin >> m;
      |                    ^