const unsigned long long INF=18446744073709551615;
unsigned long long dist[N][N],ans=0;
memset(dist,INF,sizeof dist);

结果出现

$114514.cpp:64:17: warning: overflow in conversion from ‘long long unsigned int’ to ‘int’ changes value from ‘18446744073709551615’ to ‘-1’ [-Woverflow]$

请问各位大佬，应该如何给 $unsigned \ long \ long$ 赋予最大值呢？