Eroare de compilare: main.cpp:10:144: error: 'int index' redeclared as different kind of symbol int v[MAXN + 1], first[MAXN + 1], last[MAXN + 1], wh_node[MAXN + 1], lazy[(MAXN >> BUCK) + 1], sb[(MAXN >> BUCK) + 1], eb[(MAXN >> BUCK) + 2], index, n, num_b; ^~~~~ In file included from /usr/include/c++/6/cstring:42:0, from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:48, from main.cpp:1: /usr/include/string.h:477:1: note: previous declaration 'const char* index(const char*, int)' index (const char *__s, int __c) __THROW ^~~~~ main.cpp: In function 'void dfs(int, int)': main.cpp:14:13: error: no pre-increment operator for type wh_node[++index] = node; ^~~~~ main.cpp:15:17: error: cannot resolve overloaded function 'index' based on conversion to type 'int' first[node] = index; ^~~~~ main.cpp:19:16: error: cannot resolve overloaded function 'index' based on conversion to type 'int' last[node] = index; ^~~~~ Non zero exit status: 1