Compilare: user.cpp: In function ‘int fill_v(int, int)’: user.cpp:29:14: warning: unused variable ‘f’ [-Wunused-variable] bool f = false; ^ user.cpp: In function ‘int main()’: user.cpp:58:21: warning: unused variable ‘cnt’ [-Wunused-variable] int n, m, i, j, cnt, id, jd; ^ user.cpp:58:30: warning: ‘jd’ may be used uninitialized in this function [-Wmaybe-uninitialized] int n, m, i, j, cnt, id, jd; ^ user.cpp:58:26: warning: ‘id’ may be used uninitialized in this function [-Wmaybe-uninitialized] int n, m, i, j, cnt, id, jd; ^