87 lines
1.8 KiB
C++
87 lines
1.8 KiB
C++
#include <cstdio>
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#include <cstring>
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#include <algorithm>
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#include <cmath>
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#include <string>
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#include <map>
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#define eps 1e-9
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#define LL long long
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#define mod 2333333
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using namespace std;
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map <int , int> ma;
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int pos[100];
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int clo,p,ed;
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struct node
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{
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int x,y,w;
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}a[250000];
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int f[500];
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LL te[200];
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int cmp(node a,node b)
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{
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return (a.w<b.w);
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}
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int getf(int x)
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{
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if (x==f[x]) return x;
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else return (f[x]=getf(f[x]));
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}
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int unite(int x,int y)
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{
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if (getf(x)!=getf(y)) f[getf(x)]=getf(y);
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}
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LL kru()
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{
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LL ans=0;
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for (int i=1;i<=ed;i++)
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if (getf(a[i].x)!=getf(a[i].y)) {
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ans+=a[i].w;
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unite(a[i].x,a[i].y);
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}
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return ans;
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}
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int main()
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{
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LL n,seed;
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while (~scanf("%I64d%I64d",&n,&seed))
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{
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ma.clear();
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int cur=seed;
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int t=0;
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while (ma[cur]==0)
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{
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t++;
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pos[t]=cur;
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pos[0]=cur;
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ma[cur]=1;
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cur=cur*907%mod;
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}
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for (int k=1;k<=108;k++)
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{
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for (int i=1;i<=k;i++)
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f[i]=i;
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clo=ed=0;
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for (int i=1;i<=k;i++)
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{
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clo++;
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clo%=54;
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p=pos[clo];
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for (int j=max(1,i-5);j<i;j++)
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{
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clo++;
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clo%=54;
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ed++;
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a[ed].x=i;
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a[ed].y=j;
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a[ed].w=pos[clo]^p;
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}
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}
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sort(a+1,a+1+ed,cmp);
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te[k]=kru();
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}
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if (n<=108) printf("%I64d\n",te[n]);
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else printf("%I64d\n",te[54+n%54]+(n/54-1)*(te[108]-te[54]));
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}
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return 0;
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}
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