Compilare: user.cpp: In function ‘void BuildGraph(int, int)’: user.cpp:83:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < L[n1].size(); i++) ^ user.cpp:84:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0; j < R[n2].size(); j++) ^ user.cpp: In function ‘int Solve()’: user.cpp:147:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0; j < A[i].size(); j++) ^ user.cpp:148:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k = 0; k < B[i].size(); k++) ^