Submission #417725

#	Time	Username	Problem	Language	Result	Execution time	Memory
417725		vanic	Gondola (IOI14_gondola)	C++14	60 / 100	64 ms	5104 KiB

gondola

#include "gondola.h"
#include <cmath>
#include <algorithm>
#include <vector>
#include <map>
#include <cassert>

using namespace std;

typedef long long ll;

const int maxn=1e5+5, mod=1e9+7, Log=30;

inline int sum(int a, int b){
	if(a+b>=mod){
		return a+b-mod;
	}
	if(a+b<0){
		return a+b+mod;
	}
	return a+b;
}

inline int mul(int a, int b){
	return (ll)a*b%mod;
}

inline int pot(int a, int b){
	int sol=1;
	for(int i=0; i<Log; i++){
		if((1<<i)&b){
			sol=mul(sol, a);
		}
		a=mul(a, a);
	}
	return sol;
}

int poc[maxn];
map < int, int > bio;

int valid(int n, int l[]){
	for(int i=0; i<n; i++){
		if(bio[l[i]]){
			return 0;
		}
		bio[l[i]]=1;
		poc[i]=i+1;
	}
	bio.clear();
	int pos=-1;
	for(int i=0; i<n; i++){
		if(l[i]<=n){
			pos=i;
			break;
		}
	}
	int val=l[pos];
	for(int i=0; i<n; i++){
		poc[pos]=val;
		val=(val+1)%n;
		pos=(pos+1)%n;
		if(!val){
			val=n;
		}
	}
	for(int i=0; i<n; i++){
		if(l[i]<=n && poc[i]!=l[i]){
			return 0;
		}
	}
	return 1;
}



int replacement(int n, int l[], int sol[]){
	assert(valid(n, l));
	int maksi=0, ind;
	for(int i=0; i<n; i++){
		bio[l[i]]=i;
		if(maksi<l[i]){
			maksi=l[i];
			ind=i;
		}
	}
	int pos=0;
	for(int i=n+1; i<=maksi; i++){
		if(bio.find(i)!=bio.end()){
			sol[pos]=poc[bio[i]];
			poc[bio[i]]=i;
		}
		else{
			sol[pos]=poc[ind];
			poc[ind]=i;
		}
		pos++;
	}
	
	bio.clear();
	return maksi-n;
}

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

int countReplacement(int n, int l[]){
	if(!valid(n, l)){
		return 0;
	}
	sort(l, l+n);
	vector < int > v;
	v.push_back(n+1);
	int p=-1;
	for(int i=0; i<n; i++){
		if(l[i]>n){
			if(p==-1){
				p=n-i;
			}
			v.push_back(l[i]);
		}
	}
	int sol=1;
	for(int i=0; i<(int)v.size()-1; i++){
		sol=mul(sol, pot(p, v[i+1]-v[i]));
		p--;
		
	}
	return sol;
}

Compilation message (stderr)

gondola.cpp: In function 'int replacement(int, int*, int*)':
gondola.cpp:94:20: warning: 'ind' may be used uninitialized in this function [-Wmaybe-uninitialized]
   94 |    sol[pos]=poc[ind];
      |             ~~~~~~~^

• 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: 0 / 15
• Subtask 9: 0 / 15
• Subtask 10: 0 / 10