Compilare: user.cpp: In function ‘void Solve()’: user.cpp:72:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0; i < b[0].size(); ++i ) ^ user.cpp:73:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( j = 0; j < L && i < b[j].size(); ++j ) ^ user.cpp:89:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = L - 1; i < v.size(); ++i ) ^