Compilare: main.cpp: In function 'int main()': main.cpp:139:35: warning: format '%d' expects argument of type 'int', but argument 3 has type 'std::pair<int, int>' [-Wformat=] fprintf(g,"%d ",get_ans(i)); ^ main.cpp: In function 'bool unite(int, int)': main.cpp:54:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ main.cpp: In function 'int i32()': main.cpp:79:32: 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:87:32: 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); ^