Compilare: user.cpp: In function ‘void solveEquationSystem()’: user.cpp:68:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i < V.size() && j < M) { ^ user.cpp:69:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k = i; k < V.size(); k++) ^ user.cpp:71:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(k == V.size()) { ^ user.cpp:76:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k = i + 1; k < V.size(); k++) ^