Compilare: user.cpp: In function ‘int main()’: user.cpp:27:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (nr >= v1.size()) { ~~~^~~~~~~~~~~~ user.cpp:43:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (p + x < v1.size()) { ~~~~~~^~~~~~~~~~~ user.cpp:55:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (p + y <= v1.size()) { ~~~~~~^~~~~~~~~~~~