Compilare: user.cpp: In function ‘void optim()’: user.cpp:68:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, cp = k, f = 1; ^ user.cpp:68:15: warning: unused variable ‘cp’ [-Wunused-variable] int i, j, cp = k, f = 1; ^ user.cpp: In function ‘void read()’: user.cpp:9:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("multiplu2.in", "r", stdin); ^ user.cpp:10:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &k); ^ user.cpp: In function ‘void write()’: user.cpp:99:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("multiplu2.out", "w", stdout); ^