View Compilation Error

0_0_34757227_638.cpp: In function 'int main()':
0_0_34757227_638.cpp:18:13: error: 'z' was not declared in this scope
    if(t<=n&&z!=m){
             ^
0_0_34757227_638.cpp:21:13: error: 'z' was not declared in this scope
    if(t==n&&z==m+1){
             ^
0_0_34757227_638.cpp:35:11: error: 'w' was not declared in this scope
  if(q<=n&&w!=m){
           ^
0_0_34757227_638.cpp:38:11: error: 'w' was not declared in this scope
  if(q==n&&w==m+1){
           ^