Compilare: user.cpp: In function ‘int main()’: user.cpp:81:9: warning: unused variable ‘i’ [-Wunused-variable] int t, i, j, aux, sol, a, b; ^ user.cpp:81:12: warning: unused variable ‘j’ [-Wunused-variable] int t, i, j, aux, sol, a, b; ^ user.cpp:81:15: warning: unused variable ‘aux’ [-Wunused-variable] int t, i, j, aux, sol, a, b; ^ user.cpp:81:20: warning: unused variable ‘sol’ [-Wunused-variable] int t, i, j, aux, sol, a, b; ^ user.cpp:78:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ackermann.in", "r", stdin); ^ user.cpp:79:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ackermann.out", "w", stdout); ^ user.cpp:85:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &a, &b, &p); ^