Compilare: main.cpp: In function 'int u32()': main.cpp:15:30: 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, LEN, stdin); ^ main.cpp:24:30: 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, LEN, stdin); ^ main.cpp: In function 'int main()': main.cpp:109:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("viteza.in", "r", stdin); ^ main.cpp: In function 'void df(int)': main.cpp:97:27: warning: 'ads' may be used uninitialized in this function [-Wmaybe-uninitialized] else ans[t.unde]-=ads; ^~~