Compilare: user.cpp: In function ‘void DFS2(int)’: user.cpp:33:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[node].size(); i++) ^ user.cpp: In function ‘void DFS(int)’: user.cpp:42:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[node].size(); i++) ^ user.cpp: In function ‘int bs1(int, int)’: user.cpp:81:50: warning: ‘mid’ may be used uninitialized in this function [-Wmaybe-uninitialized] int left = 0, right = Lv2[level].size() - 1, mid, sol = -1; ^ user.cpp: In function ‘int bs2(int, int)’: user.cpp:99:50: warning: ‘mid’ may be used uninitialized in this function [-Wmaybe-uninitialized] int left = 0, right = Lv2[level].size() - 1, mid, sol = -1; ^