Compilare: user.cpp: In function ‘int main()’: user.cpp:8:12: warning: unused variable ‘i’ [-Wunused-variable] int n, m, i, x, y; ^ user.cpp:8:15: warning: unused variable ‘x’ [-Wunused-variable] int n, m, i, x, y; ^ user.cpp:8:18: warning: unused variable ‘y’ [-Wunused-variable] int n, m, i, x, y; ^ user.cpp:9:6: warning: unused variable ‘a’ [-Wunused-variable] int a=0, b; ^ user.cpp:10:6: warning: unused variable ‘sol’ [-Wunused-variable] int sol; ^