Compilare: user.cpp: In function ‘int main()’: user.cpp:27:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<v[i].size();j++,l++) ^ user.cpp:40:38: warning: ‘y1’ may be used uninitialized in this function [-Wmaybe-uninitialized] printf("%d %d\n",x[x1][y1],y[x1][y1]); ^ user.cpp:40:38: warning: ‘x1’ may be used uninitialized in this function [-Wmaybe-uninitialized]