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ID题目提交者结果用时内存语言文件大小提交时间测评时间
#520638#1436. Split in Sets123456xwdWA 0ms3852kbC++141.7kb2024-08-15 14:27:092024-08-15 14:27:09

Judging History

你现在查看的是最新测评结果

  • [2024-08-15 14:27:09]
  • 评测
  • 测评结果:WA
  • 用时:0ms
  • 内存:3852kb
  • [2024-08-15 14:27:09]
  • 提交

answer

#include<bits/stdc++.h>
#define ll long long
#define pli pair<ll,int>
using namespace std;
const int N=1e5+5,MOD=1e9+7;
int n,k,a[N],b[N];
int jc[N],invf[N];
int power(int x,int y){
    int ans=1;
    for(;y;y>>=1,x=1ll*x*x%MOD) if(y&1) ans=1ll*ans*x%MOD;
    return ans;
}
int A(int n,int m){ return 1ll*jc[n]*invf[n-m]%MOD; }
int C(int n,int m){ return 1ll*jc[n]*invf[n-m]%MOD*invf[m]%MOD; }
void add(int &x,int y){ x+=y; if(x>=MOD) x-=MOD; if(x<0) x+=MOD; }
pli dfs(int d,int n,int k){
    if(d<0){
        int ans=0;
        for(int i=0;i<k;++i) add(ans,(((k-i)&1)?-1ll:1ll)*power(i,n)%MOD*C(k,i)%MOD);
        return {0,ans};
    }
    int cnt=0;
    for(int i=1;i<=n;++i) cnt+=(a[i]>>d&1);
    if(!cnt) return dfs(d-1,n,k);
    if(cnt==n){
        for(int i=1;i<=n;++i) a[i]-=(1<<d);
        auto ans=dfs(d-1,n,k);
        return {ans.first+1ll*(1<<d)*k,ans.second};
    }
    if(cnt<k){
        ll sum=0;
        for(int i=1,j=0;i<=n;++i){
            if(a[i]<(1<<d)) a[++j]=a[i];
            else sum+=a[i];
        }
        auto ans=dfs(d-1,n-cnt,k-cnt);
        return {ans.first+sum,1ll*ans.second*A(k,cnt)%MOD};
    }
    int now=(1<<30)-1,j=0;
    for(int i=1;i<=n;++i){
        if(a[i]>=(1<<d)) a[i]-=(1<<d),a[++j]=a[i];
        else now&=a[i];
    }
    a[++j]=now;
    auto ans=dfs(d-1,j,k);
    return {ans.first+1ll*(1<<d)*(k-1),ans.second};
}
int main(){
    scanf("%d%d",&n,&k);
    jc[0]=1; for(int i=1;i<=n;++i) jc[i]=1ll*jc[i-1]*i%MOD;
    invf[n]=power(jc[n],MOD-2);
    for(int i=n-1;~i;--i) invf[i]=1ll*invf[i+1]*(i+1)%MOD;
    for(int i=1;i<=n;++i) scanf("%d",&a[i]);
    auto ans=dfs(29,n,k);
    printf("%lld %d\n",ans.first,ans.second);
    return 0;
}

详细

Test #1:

score: 0
Wrong Answer
time: 0ms
memory: 3852kb

input:

3 2
4 7 5

output:

11 0

result:

wrong answer 2nd words differ - expected: '2', found: '0'