Compilare: user.cpp: In function ‘void dfs1(int)’: user.cpp:43:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<a[x].size(); i++) ~^~~~~~~~~~~~ user.cpp: In function ‘void dfs2(int, int)’: user.cpp:63:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<a[x].size(); i++) ~^~~~~~~~~~~~ user.cpp: In function ‘void dfs3(int)’: user.cpp:80:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<a[x].size(); i++) ~^~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:114:14: warning: ‘mnpoz’ may be used uninitialized in this function [-Wmaybe-uninitialized] dfs3(rad); ^