Compilare: user.cpp: In function ‘void dfs(int, int, int)’: user.cpp:35: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void dfs_2(int, int)’: user.cpp:56: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void rezolva()’: user.cpp:80: warning: name lookup of ‘i’ changed user.cpp:77: warning: matches this ‘i’ under ISO standard rules user.cpp:79: warning: matches this ‘i’ under old rules