Compilare: user.cpp: In function ‘int main()’: user.cpp:54:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 1600; j <elements.size() && x >= elements[j].value; j++) ^ user.cpp:89:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 1600; j <elements.size() && x >= elements[j].value; j++) ^ user.cpp:116:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 1118; j <elements.size() && x >= elements[j].value; j++) ^ user.cpp:135:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 700; j <elements.size() && x >= elements[j].value; j++) ^ user.cpp:146:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < elements.size(); i++) ^ user.cpp:155:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < elements.size(); i++) ^