View Compilation Error

0_0_30239348_6135.cpp: In function 'void dp(int, int)':
0_0_30239348_6135.cpp:19:29: error: 'mid' was not declared in this scope
  for(int i=1;i<=100;i++) f1[mid][i]=0x3f3f3f,f2[mid][i]=0x3f3f3f;
                             ^