Compilare: user.cpp: In function ‘int main()’: user.cpp:27:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, n, m, op, a, b, ta, tb, cost=0, lg=0; ^ user.cpp:27:21: warning: unused variable ‘op’ [-Wunused-variable] int i, j, n, m, op, a, b, ta, tb, cost=0, lg=0; ^ user.cpp:27:25: warning: unused variable ‘a’ [-Wunused-variable] int i, j, n, m, op, a, b, ta, tb, cost=0, lg=0; ^ user.cpp:27:28: warning: unused variable ‘b’ [-Wunused-variable] int i, j, n, m, op, a, b, ta, tb, cost=0, lg=0; ^