Compilare: user.cpp: In function ‘int main()’: user.cpp:26:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v.size(); i++) ^ user.cpp:31:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v.size(); i++) ^ user.cpp:36:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (index <= v.size() - index) ^ user.cpp:44:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v.size(); i++) ^ user.cpp:49:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (index <= v.size() - index) ^ user.cpp:49:27: warning: ‘index’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (index <= v.size() - index) ^ user.cpp:25:13: warning: ‘index’ may be used uninitialized in this function [-Wmaybe-uninitialized] int index, big = 100000; ^