Compilare: main.cpp: In function 'void CriticalEdges()': main.cpp:124:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < P.size(); i++) ~~^~~~~~~~~~ main.cpp: In function 'void Print()': main.cpp:142:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < P.size(); i++) ~~^~~~~~~~~~ main.cpp:144:17: warning: unused variable 'a' [-Wunused-variable] int a = P[i].first; ^ main.cpp:145:17: warning: unused variable 'b' [-Wunused-variable] int b = P[i].second; ^