View Compilation Error

0_0_30264533_29017.cpp: In function 'int find(int)':
0_0_30264533_29017.cpp:16:27: error: 'MOD' was not declared in this scope
   pos[x]=(pos[x]+pos[fa])%MOD;
                           ^
0_0_30264533_29017.cpp: In function 'int main()':
0_0_30264533_29017.cpp:38:39: error: 'MOD' was not declared in this scope
                 if(pos[v]!=(pos[u]+d)%MOD){
                                       ^
0_0_30264533_29017.cpp:44:26: error: 'MOD' was not declared in this scope
                 pos[fb]=(MOD-pos[v]+pos[u]+d)%MOD;    
                          ^