Submission #347163

#	Time	Username	Problem	Language	Result	Execution time	Memory
347163		79brue	Gondola (IOI14_gondola)	C++14	75 / 100	24 ms	2200 KiB

gondola

#include <bits/stdc++.h>
#include "gondola.h"

using namespace std;

typedef long long ll;

int valid(int n, int arr[]){
    vector<int> chk(250001);
    auto it = min_element(arr, arr+n);
    rotate(arr, it, arr+n);

    for(int i=0; i<n; i++){
        if(chk[arr[i]]) return 0;
        chk[arr[i]] = 1;
        if(arr[i] <= n && i != arr[i]-arr[0]) return 0;
    }

    return 1;
}

int replacement(int n, int arr[], int ret[]){
    auto it = min_element(arr, arr+n);
    int minV = *it, minL = it-arr;
    rotate(arr, arr+(minL - (minV%n) + 1 + n)%n, arr+n);

    vector<int> idx(250001);
    for(int i=0; i<n; i++){
        idx[arr[i]] = i+1;
    }
    int tmp = *max_element(arr, arr+n);

    for(int i=n+1; i<=tmp; i++){
        if(idx[i]) ret[i-n-1] = idx[i];
        else ret[i-n-1] = idx[tmp], idx[tmp] = i;
    }
    return tmp-n;
}

int countReplacement(int n, int arr[]){
    if(!valid(n, arr)) return 0;
    ll ans = 1;
    const ll MOD = 1000000009;

    auto it = min_element(arr, arr+n);
    int minV = *it, minL = it-arr;
    rotate(arr, arr+(minL - (minV%n) + 1 + n)%n, arr+n);

    vector<int> idx(250001);
    for(int i=0; i<n; i++){
        idx[arr[i]] = i+1;
    }
    int cnt=0;
    int tmp = *max_element(arr, arr+n);
    for(int i=n+1; i<=tmp; i++) if(idx[i]) cnt++;

    for(int i=n+1; i<=tmp; i++){
        if(idx[i]) cnt--;
        else ans *= cnt, ans %= MOD;
    }
    return ll(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