Submission #614776

#	Time	Username	Problem	Language	Result	Execution time	Memory
614776		cheissmart	Gondola (IOI14_gondola)	C++14	75 / 100	40 ms	4808 KiB

gondola

#include "gondola.h"
#include <bits/stdc++.h>
#define F first
#define S second
#define V vector
#define PB push_back
#define EB emplace_back
#define MP make_pair
#define SZ(v) int((v).size())
#define ALL(v) (v).begin(), (v).end()

using namespace std;

typedef long long ll;
typedef pair<int, int> pi;
typedef V<int> vi;

const int INF = 1e9 + 7, M = 1e9 + 9;

int valid(int n, int a[]) {
    int he = -1;
    set<int> s;
    for(int i = 0; i < n; i++) {
        if(s.count(a[i]))
            return 0;
        s.insert(a[i]);
    }
    for(int i = 0; i < n; i++) if(a[i] <= n) {
        int be = (i - a[i] + n) % n;
        if(he != -1 && he != be)
            return 0;
        he = be;
    }
    return 1;
}

int replacement(int n, int a[], int b[]) {
    assert(valid(n, a));
    int sz = 0, mx = 0;
    map<int, int> mp;
    int pos = -1;
    for(int i = 0; i < n; i++) {
        mx = max(mx, a[i]);
        if(a[i] >= n) {
            mp[a[i]] = i;
        } else {
            pos = i;
        }
    }
    if(pos == -1) {
        for(int i = 0; i < n; i++)
            a[i] = i + 1;
    } else {
        for(int i = pos + 1; i < n; i++) {
            a[i] = (a[pos] + i - pos + n - 1) % n + 1;
        }
        for(int i = 0; i < pos; i++) {
            a[i] = (a[pos] + i - pos + n - 1) % n + 1;
        }
    }
    for(int i = n + 1; i <= mx; i++) {
        if(mp.count(i)) {
            b[sz++] = a[mp[i]];
            a[mp[i]] = i;
        } else {
            b[sz++] = a[mp[mx]];
            a[mp[mx]] = i;
        }
    }
    return sz;
}

int qpow(int a, int b) {
    if(b == 0) return 1;
    ll t = qpow(a, b / 2);
    t = t * t % M;
    if(b & 1) t = t * a % M;
    return t;
}

int countReplacement(int n, int a[]) {
    if(!valid(n, a)) return 0;
    int mx = 0;
    vi aux;
    for(int i = 0; i < n; i++) {
        mx = max(mx, a[i]);
        if(a[i] > n) {
            aux.PB(a[i]);
        }
    }
    aux.PB(n);
    int ans = 1, cnt = 0;
    sort(ALL(aux), greater<int>());
    for(int i = 0; i + 1 < SZ(aux); i++) {
        for(int j = aux[i] - 1; j > aux[i + 1]; j--)
            ans = 1LL * ans * (i + 1) % M;
        // ans = 1LL * ans * qpow(i + 1, aux[i] - aux[i + 1] - 1) % M;
    }
    if(SZ(aux) == n) ans = 1LL * ans * n % M;
    return ans;
}

Compilation message (stderr)

gondola.cpp: In function 'int countReplacement(int, int*)':
gondola.cpp:92:18: warning: unused variable 'cnt' [-Wunused-variable]
   92 |     int ans = 1, cnt = 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: 0 / 15
• Subtask 10: 0 / 10