Compilare: main.cpp: In function 'bool unite(int, int)': main.cpp:31:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ main.cpp: In function 'int i32()': main.cpp:43:32: 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,f); ^ main.cpp:51:32: 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,f); ^