Compilare: user.cpp: In function ‘int main()’: user.cpp:19:18: warning: unused variable ‘d’ [-Wunused-variable] int a, b, c, d, e, f, x, i, k, j, N; ^ user.cpp:19:21: warning: unused variable ‘e’ [-Wunused-variable] int a, b, c, d, e, f, x, i, k, j, N; ^ user.cpp:19:24: warning: unused variable ‘f’ [-Wunused-variable] int a, b, c, d, e, f, x, i, k, j, N; ^ user.cpp:20:33: warning: unused variable ‘sd’ [-Wunused-variable] int sa = 0, sb = 0, sc = 0, sd = 0, se = 0, sf = 0; ^ user.cpp:20:41: warning: unused variable ‘se’ [-Wunused-variable] int sa = 0, sb = 0, sc = 0, sd = 0, se = 0, sf = 0; ^ user.cpp:20:49: warning: unused variable ‘sf’ [-Wunused-variable] int sa = 0, sb = 0, sc = 0, sd = 0, se = 0, sf = 0; ^