Compilare: main.cpp: In member function 'matrice& matrice::operator*(const matrice&)': main.cpp:22:17: warning: reference to local variable 'b' returned [-Wreturn-local-addr] matrice b; ^ main.cpp: In function 'int main()': main.cpp:62:40: warning: format '%d' expects argument of type 'int', but argument 2 has type 'long long int' [-Wformat=] printf("%d\n", fast_pow1(k - 1)); ^ main.cpp:77:43: warning: format '%d' expects argument of type 'int', but argument 2 has type 'long long int' [-Wformat=] printf("%d\n", b.mat[1][3]); ^ main.cpp:59:18: warning: unused variable 'i' [-Wunused-variable] int t, n, k, i, j; ^ main.cpp:59:21: warning: unused variable 'j' [-Wunused-variable] int t, n, k, i, j; ^ main.cpp:57:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("2sah.in", "r", stdin); ^ main.cpp:58:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("2sah.out", "w", stdout); ^ main.cpp:60:32: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &t, &n, &k); ^