Compilare: main.cpp: In function 'int main()': main.cpp:99:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("gropi.in", "r", stdin); ^ main.cpp:100:42: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("gropi.out", "w", stdout); ^ main.cpp: In function 'void read(int&)': main.cpp:14:67: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, buff_size, stdin), pos = 0; ^ main.cpp:19:66: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, buff_size, stdin), pos = 0; ^