Compilare: user.cpp: In function ‘int main()’: user.cpp:9:12: warning: unused variable ‘r’ [-Wunused-variable] int a, b, r, f = 0, p, n; ^ user.cpp:9:15: warning: unused variable ‘f’ [-Wunused-variable] int a, b, r, f = 0, p, n; ^ user.cpp:9:22: warning: unused variable ‘p’ [-Wunused-variable] int a, b, r, f = 0, p, n; ^ user.cpp:9:25: warning: variable ‘n’ set but not used [-Wunused-but-set-variable] int a, b, r, f = 0, p, n; ^ user.cpp:5:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("CMMDC.in", "r", stdin); ^ user.cpp:6:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("CMMDC.out", "w", stdout); ^ user.cpp:11:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &a, &b); ^