View Compilation Error

0_0_28901031_26103.cpp: In function 'void daan()':
0_0_28901031_26103.cpp:19:7: error: 'X' was not declared in this scope
  f[0][X] = 0;
       ^
0_0_28901031_26103.cpp:32:44: error: 'T' was not declared in this scope
    while( head <= tail && dp[head].dis < j-T ) 
                                            ^
0_0_28901031_26103.cpp:48:43: error: 'T' was not declared in this scope
    while ( head <= tail && dp[head].dis - T > j)
                                           ^
0_0_28901031_26103.cpp: In function 'int main()':
0_0_28901031_26103.cpp:65:27: error: 'N' was not declared in this scope
  while( scanf("%d%d%d%d",&N,&M,&X,&T)==4 )
                           ^
0_0_28901031_26103.cpp:65:30: error: 'M' was not declared in this scope
  while( scanf("%d%d%d%d",&N,&M,&X,&T)==4 )
                              ^
0_0_28901031_26103.cpp:65:33: error: 'X' was not declared in this scope
  while( scanf("%d%d%d%d",&N,&M,&X,&T)==4 )
                                 ^
0_0_28901031_26103.cpp:65:36: error: 'T' was not declared in this scope
  while( scanf("%d%d%d%d",&N,&M,&X,&T)==4 )
                                    ^