View Compilation Error

0_0_24937046_26101.cpp: In function 'int Search(int, int, int)':
0_0_24937046_26101.cpp:37:25: error: 'G' was not declared in this scope
      return upper_bound(G[x].begin(), G[x].end(), r) - lower_bound(G[x].begin(), G[x].end(), l);
                         ^