BZOJ 2728: [HNOI2012]与非

OrzpopoQQQ大爷

#include<iostream>#include<cstdio>#include<cstring>using namespace std;typedef long long ll;ll base[70],all,tot;ll query(ll x){if(x<0)return -1;ll ans=0,now=0;for(int i=1;i<=tot;i++)if((now|base[i])<=x)now|=base[i],ans|=1ll<<tot-i;return ans;}bool vis[70];ll a[1005];int main(){//freopen("a.in","r",stdin);int n,k;ll l,r;scanf("%d%d%lld%lld",&n,&k,&l,&r);all=(1ll<<k)-1;for(int i=1;i<=n;i++)scanf("%lld",&a[i]);for(int i=k-1;i>=0;i--)if(!vis[i]){ll now=all;for(int j=1;j<=n;j++)if(a[j]>>i&1)now&=a[j];else now&=~a[j]&all;base[++tot]=now;for(int j=0;j<=i;j++)if(now>>j&1)vis[j]=1;}printf("%lld\n",query(r)-query(l-1));return 0;}