Compilare: main.cpp: In function 'int read()': main.cpp:17:35: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(s,1,bsize,stdin); ^ main.cpp:27:35: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(s,1,bsize,stdin); ^ main.cpp: In function 'int main()': main.cpp:77:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("mine.in","r",stdin); ^ main.cpp:78:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("mine.out","w",stdout); ^