Compilare: user.cpp: In function ‘void DFS(int)’: user.cpp:10:13: warning: unused variable ‘j’ [-Wunused-variable] int k,i,j,sz=v[nod].size(),p; ^ user.cpp: In function ‘int main()’: user.cpp:30:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("3color.in","r",stdin); ^ user.cpp:31:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("3color.out","w",stdout); ^ user.cpp: In function ‘void DFS(int)’: user.cpp:22:17: warning: ‘p’ may be used uninitialized in this function [-Wmaybe-uninitialized] color[nod]=p; ^ user.cpp:22:17: warning: ‘p’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.cpp:22:17: warning: ‘p’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.cpp:22:17: warning: ‘p’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.cpp:22:17: warning: ‘p’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.cpp:22:17: warning: ‘p’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.cpp:22:17: warning: ‘p’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.cpp:22:17: warning: ‘p’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.cpp:22:17: warning: ‘p’ may be used uninitialized in this function [-Wmaybe-uninitialized]