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QOJ

IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#133594#4937. Permutation TransformationVengeful_Spirit#WA 11ms26768kbC++201.6kb2023-08-02 11:37:042023-08-02 11:37:08

Judging History

你现在查看的是最新测评结果

  • [2023-08-10 23:21:45]
  • System Update: QOJ starts to keep a history of the judgings of all the submissions.
  • [2023-08-02 11:37:08]
  • 评测
  • 测评结果:WA
  • 用时:11ms
  • 内存:26768kb
  • [2023-08-02 11:37:04]
  • 提交

answer

#include<bits/stdc++.h>
using namespace std;
const int N=1e6+5;
#define int long long
const int mo=998244353;
int vs[N], pr[N], sz[N], nm[N];

void init() {
  for(int i = 2; i < N; ++i) {
    if(!vs[i]) pr[++pr[0]] = i, vs[i] = i, nm[i] = pr[0];
    for(int j = 1; j <= pr[0] && i * pr[j] < N; ++j) {
      vs[i * pr[j]] = pr[j];
      if(i % pr[j] == 0) break;
    }
  }
}

int qpow(int a,int b){
  int res=1;
  for(;b;b>>=1,a=a*a%mo){
    if(b&1){
      res=res*a%mo;
    }
  }
  return res;
}
int vis[N],c[N],a[N];
void dfs(int x,int &cnt){
  vis[x]=1;
  cnt++;
  if(!vis[a[x]])
  dfs(a[x],cnt);
}
mt19937 rnd(0);
signed main(){
  init();
  int n;
  scanf("%lld",&n);
  for(int i=1;i<=n;i++){
    a[i]=i;
  }
  for(int i=1;i<=n;i++){
    scanf("%lld",&a[i]);
  }
  int cnt=0;
  for(int i=1;i<=n;i++){
    if(!vis[i])dfs(i,c[++cnt]);
  }
  int ans=0,gc=-1,mul=1;
  for(int i=1;i<=cnt;i++){
    int res=0;
    while(c[i]%2==0){
      c[i]/=2;
      res++;
    }
    ans=max(ans,res);
  //  cout<<c[i]<<endl;
    if(c[i]!=1){
  //     if(gc==-1)gc=mul=c[i]-1;
  //     else {gc=gcd(gc,c[i]-1);
	// mul=mul*(c[i]-1)%mo;
	// mul=mul*qpow(gc,mo-2)%mo;
  //     }
      int x = c[i] - 1;
      // cerr << x << " ";
      for(; vs[x]; ) {
        int pos = 0, tmp = vs[x];
        for(; vs[x] == tmp; x /= vs[x]) ++pos;
        // cerr << tmp << " " << pos << "\n";
        sz[nm[tmp]] = max(sz[nm[tmp]], pos);
      }
    //  cout<<gc<<' '<<mul<<endl;
    }
  }
  for(int i = 1; i <= pr[0]; ++i) mul = 1ll * mul * qpow(pr[i], sz[i]) % mo;
  ans = (ans + mul) % mo;
  printf("%lld\n",ans);
}

Details

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Test #1:

score: 100
Accepted
time: 10ms
memory: 24100kb

input:

5
3 5 1 2 4

output:

3

result:

ok single line: '3'

Test #2:

score: 0
Accepted
time: 3ms
memory: 22328kb

input:

8
7 5 1 6 8 2 3 4

output:

4

result:

ok single line: '4'

Test #3:

score: 0
Accepted
time: 10ms
memory: 20384kb

input:

1
1

output:

1

result:

ok single line: '1'

Test #4:

score: -100
Wrong Answer
time: 11ms
memory: 26768kb

input:

100000
20864 34918 58550 1465 75674 30743 27235 88900 47488 50029 46054 84871 20330 72228 16506 44561 92519 97750 82891 60324 90508 39290 24663 38077 90189 30671 95476 64027 70888 90749 22566 8525 33675 16635 23392 97636 35788 89625 41966 78051 94034 15407 26545 83799 2233 10873 56946 71566 19045 44...

output:

32660679

result:

wrong answer 1st lines differ - expected: '216333199', found: '32660679'