Compilare: user.cpp: In function ‘int main()’: user.cpp:24:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < v.size(); ++j) ^ user.cpp:32:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k = 0; k < v.size(); ++k) ^ user.cpp:44:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < v.size(); ++i) ^ user.cpp:9:24: warning: ‘poz2’ may be used uninitialized in this function [-Wmaybe-uninitialized] int N, M, x, y, poz1, poz2; ^ user.cpp:9:18: warning: ‘poz1’ may be used uninitialized in this function [-Wmaybe-uninitialized] int N, M, x, y, poz1, poz2; ^