Submission #67219

#	Time	Username	Problem	Language	Result	Execution time	Memory
67219		MKopchev	Gondola (IOI14_gondola)	C++14	100 / 100	198 ms	10188 KiB

gondola

#include<bits/stdc++.h>
#include "gondola.h"
using namespace std;
const int mod=1e9+9;
int valid(int n, int inputSeq[])
{
    set<int> uniq={};
    for(int i=0;i<n;i++)
        uniq.insert(inputSeq[i]);
    if(uniq.size()!=n)return 0;
    int mini=0;
    for(int i=1;i<n;i++)
        if(inputSeq[mini]>inputSeq[i])mini=i;
    int ind=(mini+1)%n;
    int value=-1;
    int target=inputSeq[mini];
    while(ind!=mini)
    {
        value=inputSeq[ind];
        target++;
        if(value<target)return 0;
        if(value<=n&&target<=n)
        {
            if(value!=target)return 0;
        }
        ind=(ind+1)%n;
    }
    return 1;
}
int replacement(int n, int gondolaSeq[], int replacementSeq[])
{
    int mini=0;
    for(int i=1;i<n;i++)
        if(gondolaSeq[mini]>gondolaSeq[i])mini=i;
        map<int/*number you are aiming at*/,int/*where you begin*/> start={};
    if(gondolaSeq[mini]>n)
    {
        for(int i=0;i<n;i++)
            start[gondolaSeq[i]]=i+1;
    }
    else
    {
        int value=gondolaSeq[mini],t=0;
        for(int i=mini;i!=mini||t==0;i=(i+1)%n)
        {
            start[gondolaSeq[i]]=value;
            value++;
            if(value>n)value=1;
            t++;
        }
    }
    int prev=n,ind=0;
    //for(auto k:start)cout<<k.first<<" "<<k.second<<endl;
    for(auto k:start)
    {
        if(k.first!=k.second)
        {
            replacementSeq[ind++]=k.second;
            prev++;
            while(prev!=k.first)
            {
                replacementSeq[ind++]=prev;
                prev++;
            }
        }
        prev=max(prev,k.first);
    }

    //cout<<ind<<" : ";for(int i=0;i<ind;i++)cout<<replacementSeq[i]<<" ";cout<<endl;
    return ind;
}
long long my_pow(long long a,long long b)
{
    if(b==0)return 1;
    long long c=my_pow(a,b/2);
    if(b%2==0)return c*c%mod;
    return c*c%mod*a%mod;
}
int countReplacement(int n, int inputSeq[])
{
    if(valid(n,inputSeq)==0)return 0;
    int mini=0;
    for(int i=1;i<n;i++)
        if(inputSeq[mini]>inputSeq[i])mini=i;
    set<int> integers={};
    long long result=1;
    if(inputSeq[mini]>n)
    {
        result=n;
        for(int i=0;i<n;i++)
            integers.insert(inputSeq[i]);
    }
    else
    {
            int value=inputSeq[mini],t=0;
        for(int i=mini;i!=mini||t==0;i=(i+1)%n)
        {
            if(inputSeq[i]!=value)integers.insert(inputSeq[i]);
            value++;
            if(value>n)value=1;
            t++;
        }
    }
    int prev=n,active=integers.size();
    for(auto k:integers)
    {
        result=result*my_pow(active,k-prev-1)%mod;
        prev=k;
        active--;
    }
    return result;
}
/*
int n=4;
int v[]={1, 2, 7, 6};
int arr[7];
int main()
{
    cout<<countReplacement(n,v)<<endl;
}
*/

Compilation message (stderr)

gondola.cpp: In function 'int valid(int, int*)':
gondola.cpp:10:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if(uniq.size()!=n)return 0;
        ~~~~~~~~~~~^~~
gondola.cpp: In function 'int replacement(int, int*, int*)':
gondola.cpp:33:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
     for(int i=1;i<n;i++)
     ^~~
gondola.cpp:35:9: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
         map<int/*number you are aiming at*/,int/*where you begin*/> start={};
         ^~~

• 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: 15 / 15
• Subtask 10: 10 / 10