Compilare: user.cpp: In function ‘int main()’: user.cpp:13:65: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] #define STDIN_FILE_OPEN(FileName) {freopen(FileName, "r", stdin);} ^ user.cpp:28:2: note: in expansion of macro ‘STDIN_FILE_OPEN’ STDIN_FILE_OPEN("rucsac.in"); ^ user.cpp:14:67: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] #define STDOUT_FILE_OPEN(FileName) {freopen(FileName, "w", stdout);} ^ user.cpp:29:2: note: in expansion of macro ‘STDOUT_FILE_OPEN’ STDOUT_FILE_OPEN("rucsac.out"); ^ user.cpp:32:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &g); ^ user.cpp:38:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &w, &p); ^