Compilare: user.cpp: In function ‘void Solve()’: user.cpp:148:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0;i < startmargins.size();++i) ^ user.cpp:168:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0;j < finishmargins.size();++j) ^ user.cpp:184:6: warning: unused variable ‘i’ [-Wunused-variable] int i, j, x, y, k; ^ user.cpp:184:9: warning: unused variable ‘j’ [-Wunused-variable] int i, j, x, y, k; ^