Compilare: user.cpp: In function ‘int powm(int (*)[3], int, int (*)[3])’: user.cpp:40:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:44:9: warning: unused variable ‘a’ [-Wunused-variable] int a[3][3] = {{0, 1, 0},{0, 0, 1}, {1, 1, 1}}; ^ user.cpp:45:9: warning: unused variable ‘p’ [-Wunused-variable] int p[3][3] = {{1, 0, 0},{0, 1, 0}, {0, 0, 1}}; ^