Compilare: user.cpp: In function ‘bool citire()’: user.cpp:24:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else for (int i = 1; i <= 2*n; i++) ^ user.cpp: In function ‘void rezolva()’: user.cpp:41:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 1; i <= n; i++) ^ user.cpp:43:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 1; i <= n; i++) ^