Submission #165040

#	Time	Username	Problem	Language	Result	Execution time	Memory
165040		kostia244	Gondola (IOI14_gondola)	C++17	75 / 100	52 ms	7928 KiB

gondola

#include "gondola.h"
#include<bits/stdc++.h>
#define pb push_back
#define all(x) x.begin(), x.end()
using namespace std;
using ll = long long;
using vi = vector<int>;
int valid(int n, int a[]) {
	set<int> x;
	int p = 0;
	for(int i = 0; i < n; i++) {
		if(!x.insert(a[i]).second) return 0;
		if(a[p]>a[i]) p = i;
	}
	if(p>n) return true;
	int u = a[p];
	for(int i = 0; i < n; i++) {
		if(a[p]<=n&&a[p]!=u) return 0;
		if(a[p]>n)
			a[p]=u;
		p = (p+1)%n;
		u = (u%n)+1;
	}
	return 1;
}

//----------------------
int pos[4*250250];
int replacement(int n, int a[], int b[]) {
	memset(pos, -1, sizeof pos);
	int mp = 0, p = 0;
	for(int i = 0; i < n; i++) {
		if(a[i] > n) {
			pos[a[i]] = i;
		}
		if(a[i]>a[mp]) mp=i;
		if(a[i]<a[p]) p=i;
	}
	if(a[mp]<=n) return 0;
	int M = a[mp], l = 0;
	if(a[p]>n) a[p] = 1;
	int u = a[p];
	for(int i = 0; i < n; i++) {
		a[p] = u;
		p = (p+1)%n;
		u = (u%n)+1;
	}
	for(int i = n+1; i <= M; i++) {
		if(pos[i]!=-1) {
			b[l++] = a[pos[i]];
			a[pos[i]] = i;
		} else {
			b[l++] = a[mp];
			a[mp] = i;
		}
	}
	return l;
}

//----------------------
ll mod = 1e9+9;
int countReplacement(int n, int a[]) {
	ll ans = 1, use = 0;
	memset(pos, -1, sizeof pos);
	int mp = 0, p = 0;
	for(int i = 0; i < n; i++) {
		if(a[i] > n) {
			pos[a[i]] = i;
			use++;
		}
		if(a[i]>a[mp]) mp=i;
		if(a[i]<a[p]) p=i;
	}
	int M = a[mp], l = 0, GG = 0;
	if(a[p]>n) a[p] = 1, GG = 1;
	if(a[mp]<=n) return 1;
	if(!valid(n, a)) return 0;
	for(int i = 0; i < n; i++) if(a[i]>n) cout << "213213312";
	for(int i = n+1; i <= M; i++) {
		if(pos[i]!=-1) {
			a[pos[i]] = i;
			use--;
		} else {
			ans = (ans*use)%mod;
			a[mp] = i;
		}
	}
	while(GG&&n) (ans *= n--)%=mod;
	return ans;
}

Compilation message (stderr)

gondola.cpp: In function 'int countReplacement(int, int*)':
gondola.cpp:74:17: warning: unused variable 'l' [-Wunused-variable]
  int M = a[mp], l = 0, GG = 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