View Compilation Error

0_0_22804707_13242.cpp: In function 'bool dfs2(int, int, int)':
0_0_22804707_13242.cpp:46:51: error: 'i' was not declared in this scope
     return (R[u] >= L[u]) && (L[u] <= sz[u]) && R[i] >= 0;
                                                   ^