Compilare: user.cpp: In function ‘int main()’: user.cpp:81:10: warning: unused variable ‘sums’ [-Wunused-variable] double sums[MAT_MAX_SIZE], diffs[MAT_MAX_SIZE]; ^ user.cpp:81:30: warning: unused variable ‘diffs’ [-Wunused-variable] double sums[MAT_MAX_SIZE], diffs[MAT_MAX_SIZE]; ^ user.cpp:83:10: warning: unused variable ‘dets’ [-Wunused-variable] double dets[MAT_MAX_SIZE][MAT_MAX_SIZE]; ^ user.cpp:51:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(IN_FILE_NAME, "r", stdin); ^ user.cpp:52:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(OUT_FILE_NAME, "w", stdout); ^ user.cpp:54:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &tests); ^ user.cpp:58:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:67:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &nr); ^