Compilare: user.cpp: In function ‘int main()’: user.cpp:18:15: warning: unused variable ‘a’ [-Wunused-variable] int n, m, i, a, b, c, j,x; ^ user.cpp:18:18: warning: unused variable ‘b’ [-Wunused-variable] int n, m, i, a, b, c, j,x; ^ user.cpp:18:21: warning: unused variable ‘c’ [-Wunused-variable] int n, m, i, a, b, c, j,x; ^