View Compilation Error

0_0_18494840_207.cpp: In function 'void centroid(point*, int, point&, double&)':
0_0_18494840_207.cpp:67:6: error: 'i' was not declared in this scope
  REP(i,0,n){
      ^
0_0_18494840_207.cpp:67:11: error: 'REP' was not declared in this scope
  REP(i,0,n){
           ^
0_0_18494840_207.cpp: In function 'void unioncircle(circle*, int, point&, double&)':
0_0_18494840_207.cpp:76:6: error: 'i' was not declared in this scope
  REP(i,0,n){
      ^
0_0_18494840_207.cpp:76:11: error: 'REP' was not declared in this scope
  REP(i,0,n){
           ^
0_0_18494840_207.cpp: In function 'void solve()':
0_0_18494840_207.cpp:123:6: error: 'i' was not declared in this scope
  REP(i,0,n){
      ^
0_0_18494840_207.cpp:123:11: error: 'REP' was not declared in this scope
  REP(i,0,n){
           ^