Compilare: user.cpp: In function ‘void make_matrix()’: user.cpp:136:12: warning: unused variable ‘k’ [-Wunused-variable] int i, k, j; ^ user.cpp:136:15: warning: unused variable ‘j’ [-Wunused-variable] int i, k, j; ^ user.cpp: In function ‘int main()’: user.cpp:202:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("biomech.in","r",stdin); ^ user.cpp:203:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("biomech.out","w",stdout); ^ user.cpp:205:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld", &t); ^ user.cpp:208:42: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld", &rot_pay[i][j]); ^ user.cpp:212:43: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld", &move_pay[i][j]); ^