Compilare: user.cpp: In function ‘void solve_test()’: user.cpp:77:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (st < line[i - 1].size() && line[i - 1][ st ].sf < line[ i ][ j ].inc) ^ user.cpp:80:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (dr < line[i - 1].size() && line[i - 1][ dr ].inc <= line[ i ][ j ].sf) ^