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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 |
---|---|---|---|---|---|---|---|---|---|
#688051 | #8150. XOR Sum | wsxcb | WA | 1ms | 3760kb | C++17 | 1.3kb | 2024-10-29 22:57:20 | 2024-10-29 22:57:21 |
Judging History
answer
#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define pb push_back
#define fi first
#define se second
typedef vector<vector<ll>> Mat;
#define int long long
const int N=2000+10,mod=1e9+7,inf=1e9+1,P=998244353;
const double pi=acos(-1.0),esp=1e-9;
const ll INF=1e18;
int n,m,k,pw[50];
int C[50][50];
map<int,int>dp[50][20];
void add(int &x,int y){
x+=y;
if(x>mod)x-=mod;
}
int dfs(int now,int cnt,int sum){
//cout<<now<<' '<<sum<<'\n';
if(now<0)return sum==0;
if(dp[now][cnt].count(sum))return dp[now][cnt][sum];
if(sum<0||(pw[now+1]-1)*(k/2)*(k-k/2)<sum)return 0;
int ans=0;
if((m>>now)&1)
{
for(int i=0;i<=cnt;i++)
for(int j=0;j<=k-cnt;j++)
add(ans,
C[cnt][i]*C[k-cnt][j]%mod*
dfs(now-1,i,sum-pw[now]*(i+j)*(k-i-j))%mod);
}
else
{
for(int i=0;i<=k-cnt;i++){
add(ans,C[k-cnt][i]*dfs(now-1,cnt,sum-pw[now]*i*(k-i))%mod);
}
}
dp[now][cnt][sum]=ans%mod;
return ans%mod;
}
void solve()
{
cin>>n>>m>>k;
C[0][0]=1;
pw[0]=1;
for(int i=1;i<50;i++)pw[i]=pw[i-1]*2%mod;
for(int i=1;i<=k;i++){
C[i][0]=1;
for(int j=1;j<=i;j++)
C[i][j]=(C[i-1][j-1]+C[i-1][j])%mod;
}
cout<<dfs(40,k,n)%mod<<'\n';
}
signed main()
{
ios::sync_with_stdio(false);
cin.tie(0);cout.tie(0);
int t=1;
//cin>>t;
while(t--)
solve();
return 0;
}
详细
Test #1:
score: 100
Accepted
time: 1ms
memory: 3672kb
input:
6 2 3
output:
12
result:
ok 1 number(s): "12"
Test #2:
score: 0
Accepted
time: 0ms
memory: 3636kb
input:
30 6 5
output:
1520
result:
ok 1 number(s): "1520"
Test #3:
score: 0
Accepted
time: 0ms
memory: 3700kb
input:
0 0 1
output:
1
result:
ok 1 number(s): "1"
Test #4:
score: 0
Accepted
time: 0ms
memory: 3632kb
input:
0 0 2
output:
1
result:
ok 1 number(s): "1"
Test #5:
score: 0
Accepted
time: 0ms
memory: 3636kb
input:
0 1145141919 2
output:
145141913
result:
ok 1 number(s): "145141913"
Test #6:
score: 0
Accepted
time: 0ms
memory: 3708kb
input:
0 0 18
output:
1
result:
ok 1 number(s): "1"
Test #7:
score: 0
Accepted
time: 0ms
memory: 3644kb
input:
0 12412414 18
output:
12412415
result:
ok 1 number(s): "12412415"
Test #8:
score: -100
Wrong Answer
time: 0ms
memory: 3760kb
input:
32071009996106 682053093123 12
output:
0
result:
wrong answer 1st numbers differ - expected: '443207413', found: '0'