Submission #614711

#	Time	Username	Problem	Language	Result	Execution time	Memory
614711		cheissmart	Gondola (IOI14_gondola)	C++14	65 / 100	37 ms	3760 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;
    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 countReplacement(int n, int a[]) {
    if(!valid(n, a)) return 0;
    int mx = 0;
    set<int> s;
    for(int i = 0; i < n; i++) {
        mx = max(mx, a[i]);
        if(a[i] >= n) {
            s.insert(a[i]);
        }
    }
    int ans = 1, cnt = 0;
    for(int i = mx; i >= n + 1; i--) {
        if(s.count(i)) {
            cnt++;
        } else {
            ans = 1LL * ans * cnt % M;
        }
    }
    return ans;
}

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 0 / 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