Eroare de compilare: user.cpp:10:5: error: ‘int index’ redeclared as different kind of symbol int index; ^ In file included from /usr/include/c++/4.8/cstring:42:0, from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:48, from user.cpp:1: /usr/include/string.h:482:1: error: previous declaration of ‘const char* index(const char*, int)’ index (__const char *__s, int __c) __THROW ^ user.cpp: In function ‘void tarjan(int)’: user.cpp:15:35: error: no pre-increment operator for type pos[node] = lowlink[node] = ++index; ^ user.cpp: In function ‘int main()’: user.cpp:50:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < M.size(); i++){ ^ user.cpp:51:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < M[i].size(); j++) ^ user.cpp:41:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d", &n, &m); ^ user.cpp:44:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d", &x, &y); ^