Compilare: main.cpp: In function 'int ers(int, int)': main.cpp:26:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v[x].size();i++) ~^~~~~~~~~~~~ main.cpp:29:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v[y].size();i++) ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:39:31: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread (buff,1,5222500,fin); ^