Submission #586971

#	Time	Username	Problem	Language	Result	Execution time	Memory
586971		krit3379	Gondola (IOI14_gondola)	C++17	75 / 100	44 ms	4520 KiB

gondola

#include<bits/stdc++.h>
using namespace std;
#include "gondola.h"
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
#define N 100005

int valid(int n, int a[]){
    int i;
    long long mod=1e18;
    set<int> s;
    for(i=0;i<n;i++){
        if(s.count(a[i]))return 0;
        s.insert(a[i]);
        if(a[i]>n)continue;
        if(mod==1e18)mod=(i-a[i]+n)%n;
        else if(mod!=(i-a[i]+n)%n)return 0;
    }
    return 1;
}

int replacement(int n, int a[], int b[]){
    int i,j,now,last,cnt;
    vector<pair<int,int>> v;
    for(i=0;i<n;i++)if(a[i]>n)v.push_back({a[i],i});
    for(i=0;i<n;i++){
        if(a[i]<=n){
            now=a[i];
            for(j=i+1;j<n;j++){
                now++;
                if(now==n+1)now=1;
                a[j]=now;
            }
            for(j=0;j<i;j++){
                now++;
                if(now==n+1)now=1;
                a[j]=now;
            }
            break;
        }
    }
    if(i==n)for(i=0;i<n;i++)a[i]=i+1;
    sort(v.begin(),v.end());
    i=0;
    last=n;
    for(auto [now,x]:v){
        cnt=now-last;
        while(cnt--)b[i++]=a[x],a[x]=i+n;
        last=now;
    }
    return i;
}

long long mod=1e9+9;

long long bp(long long a,long long b){
    if(b==0)return 1;
    long long temp=bp(a,b/2);
    if(b%2)return temp*temp%mod*a%mod;
    return temp*temp%mod;
}

int countReplacement(int n, int a[]){
    int i,len,last;
    long long ans=1;
    vector<int> v;
    if(!valid(n,a))return 0;
    for(i=0;i<n;i++)if(a[i]>n)v.push_back(a[i]);
    sort(v.begin(),v.end());
    len=v.size();
    last=n;
    for(i=0;i<len;i++){
        ans=ans*bp(len-i,v[i]-last-1)%mod;
        last=v[i];
    }
    if(len==n)for(i=2;i<=n;i++)ans=ans*i%mod;
    return ans;
}

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 10 / 10
• Subtask 4: 5 / 5
• Subtask 5: 10 / 10
• Subtask 6: 20 / 20
• Subtask 7: 5 / 5
• Subtask 8: 15 / 15
• Subtask 9: 0 / 15
• Subtask 10: 0 / 10