Submission #587074

#	Time	Username	Problem	Language	Result	Execution time	Memory
587074		hibiki	Gondola (IOI14_gondola)	C++11	90 / 100	46 ms	9812 KiB

gondola

#include "gondola.h"
#include<bits/stdc++.h>
using namespace std;

#define mod 1000000009
#define pb push_back
#define f first
#define s second
#define sz(x) (int)x.size()
#define all(x) x.begin(),x.end()

int valid(int n, int a[])
{
    map<int,bool> use;
    pair<int,int> mn = {1e9, 1e9};
    for(int i = 0; i < n; i++)
    {
        mn = min(mn, {a[i], i});
        if(use.count(a[i])) return 0;
        use[a[i]] = true;
    }
    if(mn.f > n) return 1;
    if(mn.f < 1) return 0;
    for(int i = 0; i < n; i++)
    {
        if(a[(mn.s + i) % n] <= n && a[(mn.s + i) % n] != (mn.f + i + n - 1) % n + 1)
            return 0;
    }
    return 1;
}

//----------------------

int to[250005], use[250005];
int replacement(int n, int a[], int ans[])
{
    int mx = 0;
    int cur = -1, idx = 0;
    pair<int,int> mn = {1e9, 1e9};
    for(int i = 0; i < n; i++)
        mn = min(mn, {a[i], i}), mx = max(mx, a[i]);
    for(int i = 0; i < n; i++)
        if(a[(mn.s + i) % n] != (mn.f + i + n - 1) % n + 1)
        {
            to[(mn.f + i + n - 1) % n + 1] = a[(mn.s + i) % n];
            if(a[(mn.s + i) % n] == mx)
                cur = (mn.f + i + n - 1) % n + 1;
            else
                use[a[(mn.s + i) % n]] = (mn.f + i + n - 1) % n + 1;
        }
    for(int i = n + 1; i <= mx; i++)
    {
        if(use[i])
            ans[idx++] = use[i];
        else
            ans[idx++] = cur, cur = i;
    }
    return idx;
}

//----------------------

int fast_pow(long long base, long long pw)
{
    if(pw == 0) return 1;
    long long ret = 1ll;
    long long mul = base;
    while(pw > 0)
    {
        if(pw & 1)
            ret = (ret * mul) % mod;
        mul = (mul * mul) % mod;
        pw >>= 1;
    }
    return ret;
}

int countReplacement(int n, int a[])
{
    if(!valid(n, a)) return 0;
    int mx = 0;
    vector<int> v;
    long long cal = 1ll;
    pair<int,int> mn = {1e9, 1e9};
    for(int i = 0; i < n; i++)
    {
        mn = min(mn, {a[i], i});
        if(a[i] > n) v.pb(a[i]), use[a[i]] = 1;
    }
    if(mn.f > n)
        cal *= n;
    v.pb(n);
    sort(all(v));
    for(int i = 1; i < sz(v); i++)
    {
        if(v[i] - v[i - 1] - 1 == 0) continue;
        cal *= fast_pow((sz(v) - i), (v[i] - v[i - 1] - 1));
        cal %= mod;
    }
    return cal;
}

Compilation message (stderr)

gondola.cpp: In function 'int countReplacement(int, int*)':
gondola.cpp:81:9: warning: unused variable 'mx' [-Wunused-variable]
   81 |     int mx = 0;
      |         ^~

• 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: 15 / 15
• Subtask 10: 0 / 10