Submission #68812

#	Time	Username	Problem	Language	Result	Execution time	Memory
68812		Vahan	Gondola (IOI14_gondola)	C++17	40 / 100	36 ms	2872 KiB

gondola

#include "gondola.h"
#include<vector>
#include<algorithm>
#include<iostream>
using namespace std;
int x[200000],xx[200000];
int mod=1000000009;
vector<int> g;
int valid(int n, int inputSeq[])
{
    vector<int> v;
    for(int i=0;i<n;i++)
        xx[i]=inputSeq[i];
    sort(xx,xx+n);
    int t=0;
    for(int i=1;i<n;i++)
        if(xx[i]==xx[i-1])
        {
            t=1;
            break;
        }
    if(t==1)
        return 0;
    for(int i=0;i<n;i++)
    {
        if(inputSeq[i]<=n)
        {
            v.push_back(inputSeq[i]);
            x[inputSeq[i]]=i;
        }
    }
    t=0;
    for(int i=1;i<v.size();i++)
    {
        if(v[i-1]>v[i])
            t++;
    }
    if(t>=2)
        return 0;
    if(t==1 && v.back()>v[0])
        return 0;
    t=0;
    for(int i=1;i<v.size();i++)
    {
        if(v[i-1]<v[i])
        {
            if(v[i]-v[i-1]!=x[v[i]]-x[v[i-1]])
            {
                t=1;
                break;
            }
        }
        else if(v[i-1]>v[i])
        {
            if((n-(v[i-1]-v[i]))!=x[v[i]]-x[v[i-1]])
            {
                t=1;
                break;
            }
        }
    }
    if(t==1)
        return 0;
    return 1;
}
long long binpow(int a,int b)
{
    if(b==0)
        return 1;
    if(b%2==0)
    {
        long long c=binpow(a,b/2);
        return (c*c)%mod;
    }
    else
    {
        long long c=binpow(a,b/2);
        return (a*(c*c)%mod)%mod;
    }
}
//----------------------

int replacement(int n, int gondolaSeq[], int replacementSeq[])
{
  return -2;
}

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

int countReplacement(int n, int inputSeq[])
{
    if(valid(n,inputSeq)==0)
        return 0;
    for(int i=0;i<n;i++)
    {
        if(inputSeq[i]>n)
            g.push_back(inputSeq[i]);
    }
    sort(g.begin(),g.end());
    int k=g.size();
    long long pat=1;
    for(int i=0;i<g.size();i++)
    {
        int u;
        if(i==0)
            u=g[i]-n-1;
        else
            u=g[i]-g[i-1]-1;
        pat*=binpow(k,u);
        pat%=mod;
        k--;
    }
    if(g.size()==n)
        pat*=n;
    pat%=mod;
    return pat;
}

Compilation message (stderr)

gondola.cpp: In function 'int valid(int, int*)':
gondola.cpp:33:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=1;i<v.size();i++)
                 ~^~~~~~~~~
gondola.cpp:43:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=1;i<v.size();i++)
                 ~^~~~~~~~~
gondola.cpp: In function 'int countReplacement(int, int*)':
gondola.cpp:102:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<g.size();i++)
                 ~^~~~~~~~~
gondola.cpp:113:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if(g.size()==n)
        ~~~~~~~~^~~

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 10 / 10
• Subtask 4: 0 / 5
• Subtask 5: 0 / 10
• Subtask 6: 0 / 20
• Subtask 7: 5 / 5
• Subtask 8: 15 / 15
• Subtask 9: 0 / 15
• Subtask 10: 0 / 10