Compilare: user.cpp: In function ‘int main()’: user.cpp:40:9: warning: unused variable ‘n’ [-Wunused-variable] int n, m, x, y, xi, xf, yi, yf,a; ^ user.cpp:40:12: warning: unused variable ‘m’ [-Wunused-variable] int n, m, x, y, xi, xf, yi, yf,a; ^ user.cpp:40:15: warning: unused variable ‘x’ [-Wunused-variable] int n, m, x, y, xi, xf, yi, yf,a; ^ user.cpp:40:18: warning: unused variable ‘y’ [-Wunused-variable] int n, m, x, y, xi, xf, yi, yf,a; ^ user.cpp:40:21: warning: unused variable ‘xi’ [-Wunused-variable] int n, m, x, y, xi, xf, yi, yf,a; ^ user.cpp:40:25: warning: unused variable ‘xf’ [-Wunused-variable] int n, m, x, y, xi, xf, yi, yf,a; ^ user.cpp:40:29: warning: unused variable ‘yi’ [-Wunused-variable] int n, m, x, y, xi, xf, yi, yf,a; ^ user.cpp:40:33: warning: unused variable ‘yf’ [-Wunused-variable] int n, m, x, y, xi, xf, yi, yf,a; ^