Compilare: user.cpp: In function ‘void coboara(int)’: user.cpp:48:29: warning: suggest parentheses around ‘+’ inside ‘<<’ [-Wparentheses] int st = p << 1, dr = p << 1 + 1, best = p; ^ user.cpp: In function ‘void dijkstra(int)’: user.cpp:78:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < a[x].size(); i++) { ^