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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
#802453#8150. XOR SumMaxduan#WA 3ms6172kbC++233.0kb2024-12-07 13:44:042024-12-07 13:44:05

Judging History

你现在查看的是最新测评结果

  • [2024-12-07 13:44:05]
  • 评测
  • 测评结果:WA
  • 用时:3ms
  • 内存:6172kb
  • [2024-12-07 13:44:04]
  • 提交

answer

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define maxn 100005
const int p=1e9+7;
int dp[70][1<<7][20];
int N[70],M[70];
int ok[101];
vector<int>h[1<<7];
int fac[maxn],inv[maxn];

int qpow(int a,int b){
    int ans=1;
    int tmp=a;
    while(b){
        if(b&1){
            ans=ans*tmp%p;
        }
        tmp=tmp*tmp%p;
        b>>=1;
    }
    return ans;
}

int C(int a,int b){
    if (a < b) return 0;
    return fac[a]*inv[b]%p*inv[a-b]%p;
}

void solve(){
    
    int n,m,k;cin>>n>>m>>k;
    memset(ok,-1,sizeof(ok));
    for(int i=0;i<=k/2;i++){
        ok[i*(k-i)]=i;
    }
    for(int i=60;i>=0;i--){
        N[i]=(n>>i&1);
        M[i]=(m>>i&1);
    }
    dp[60][0][k]=1;
    for(int i=0;i<(1<<7);i++){
        for(int j=0;j<(1<<7);j++){
            if((j|i)==j){
                h[i].push_back(j);
            }
        }
    }
    int ans=0;
    for(int i=60;i>=0;i--){
        for(int v=0;v<(1<<7);v++){
            int tmp=0;
            for(int u=0;u<7;u++){
                if(v>>u&1){
                    tmp+=(1<<u);
                }
            }
            if(ok[tmp]==-1)continue;
            for(int cnt=0;cnt<=k;cnt++){
                for(auto u:h[v]){
                    if(dp[i][u][cnt]==0)continue;
                    int nxt=((u^v)<<1)+(i>0?N[i-1]:0);
                    if(nxt>=(1<<7))continue;
                    for(int cnt2=0;cnt2<=cnt;cnt2++){
                        if(M[i]==0&&cnt2!=cnt)continue;
                        int x=ok[tmp],y=k-ok[tmp];//0 1
                        if(cnt-cnt2<=y){
                            int tp=C(k-cnt,y-cnt+cnt2)*C(cnt,cnt2)%p;
                            if(i>0){
                                dp[i-1][nxt][cnt2]+=dp[i][u][cnt]*tp%p;
                                if(dp[i-1][nxt][cnt2]>=p)dp[i-1][nxt][cnt2]-=p;
                            }
                            else if(nxt==0){
                                ans+=dp[i][u][cnt]*tp%p;
                            }
                        }
                        swap(x,y);
                        if(cnt-cnt2<=y&&x!=y){
                            
                            int tp=C(k-cnt,y-cnt+cnt2)*C(cnt,cnt2)%p;
                            if(i>0){
                                dp[i-1][nxt][cnt2]+=dp[i][u][cnt]*tp%p;
                                if(dp[i-1][nxt][cnt2]>=p)dp[i-1][nxt][cnt2]-=p;
                            }
                            else if(nxt==0){
                                ans+=dp[i][u][cnt]*tp%p;
                            }
                            
                        }
                    }
                }
            }
        }
    }

    cout<<ans%p;
}

signed main(){
    ios::sync_with_stdio(0);
    cin.tie(0);
    fac[0]=1;
    for(int i=1;i<maxn;i++){
        fac[i]=fac[i-1]*i%p;
    }
    inv[maxn-1]=qpow(fac[maxn-1],p-2);
    for(int i=maxn-2;i>=0;i--){
        inv[i]=inv[i+1]*(i+1)%p;
    }

    solve();
}

詳細信息

Test #1:

score: 100
Accepted
time: 2ms
memory: 5432kb

input:

6 2 3

output:

12

result:

ok 1 number(s): "12"

Test #2:

score: 0
Accepted
time: 2ms
memory: 5512kb

input:

30 6 5

output:

1520

result:

ok 1 number(s): "1520"

Test #3:

score: 0
Accepted
time: 0ms
memory: 5424kb

input:

0 0 1

output:

1

result:

ok 1 number(s): "1"

Test #4:

score: 0
Accepted
time: 0ms
memory: 5556kb

input:

0 0 2

output:

1

result:

ok 1 number(s): "1"

Test #5:

score: 0
Accepted
time: 2ms
memory: 5508kb

input:

0 1145141919 2

output:

145141913

result:

ok 1 number(s): "145141913"

Test #6:

score: 0
Accepted
time: 3ms
memory: 5560kb

input:

0 0 18

output:

1

result:

ok 1 number(s): "1"

Test #7:

score: 0
Accepted
time: 0ms
memory: 6012kb

input:

0 12412414 18

output:

12412415

result:

ok 1 number(s): "12412415"

Test #8:

score: -100
Wrong Answer
time: 0ms
memory: 6172kb

input:

32071009996106 682053093123 12

output:

0

result:

wrong answer 1st numbers differ - expected: '443207413', found: '0'