Compilare: user.cpp: In function ‘int main()’: user.cpp:39:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<v[i].size();j++,l++) ^ user.cpp:52:17: warning: ‘y1’ may be used uninitialized in this function [-Wmaybe-uninitialized] reconst(x1,y1); ^ user.cpp:52:17: warning: ‘x1’ may be used uninitialized in this function [-Wmaybe-uninitialized] /tmp/ccgackI6.o: In function `main': user.cpp:(.text.startup+0x83): warning: the `gets' function is dangerous and should not be used.