Submission #589297

#	Time	Username	Problem	Language	Result	Execution time	Memory
589297		yutabi	Gondola (IOI14_gondola)	C++14	75 / 100	32 ms	5020 KiB

gondola

#include "gondola.h"


#include <bits/stdc++.h>
using namespace std;

#define MOD 1000000009


#define pb push_back


typedef long long ll;
typedef pair <int,int> ii;


int valid(int n, int s[])
{
    set <int> st;

    int diff=-1;

    bool flag=0;

    for(int i=0;i<n;i++)
    {
        st.insert(s[i]);

        if(s[i]<=n)
        {
            int num=(s[i]+n-i)%n;

            if(diff!=-1 && diff!=num)
            {
                flag=1;
            }

            diff=num;
        }
    }

    if(st.size()!=n)
    {
        flag=1;
    }

    if(flag)
    {
        return 0;
    }

    return 1;
}

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

int replacement(int n, int ss[], int res[])
{
    vector <ii> s;

    int diff=0;

    for(int i=0;i<n;i++)
    {
        if(ss[i]<=n)
        {
            diff=(ss[i]+n-i-1)%n;
        }

        else
        {
            s.pb(ii(ss[i],i));
        }
    }

    sort(s.begin(),s.end());

    int ans=0;

    int curr=n;

    for(int i=0;i<s.size();i++)
    {
        res[ans]=((s[i].second+diff)%n)+1;
        ans++;
        curr++;

        while(curr<s[i].first)
        {
            res[ans]=curr;
            ans++;
            curr++;
        }
    }

    return ans;
}

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

ll fast_pow(ll a, ll b)
{
    ll res=1;
    ll curr=a;

    while(b)
    {
        if(b%2)
        {
            res*=curr;
            res%=MOD;
        }

        b/=2;
        curr*=curr;
        curr%=MOD;
    }

    return res;
}

int countReplacement(int n, int ss[])
{
    if(valid(n,ss)==0)
    {
        return 0;
    }

    ll ans=1;

    vector <ii> s;

    int diff=0;

    for(int i=0;i<n;i++)
    {
        if(ss[i]<=n)
        {
            diff=(ss[i]+n-i-1)%n;
        }

        else
        {
            s.pb(ii(ss[i],i));
        }
    }

    sort(s.begin(),s.end());

    ll curr=n;

    for(int i=0;i<s.size();i++)
    {
        ans*=fast_pow(s.size()-i, s[i].first-curr-1);
        ans%=MOD;

        curr=s[i].first;
    }

    return ans;
}

Compilation message (stderr)

gondola.cpp: In function 'int valid(int, int*)':
gondola.cpp:42:17: warning: comparison of integer expressions of different signedness: 'std::set<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   42 |     if(st.size()!=n)
      |        ~~~~~~~~~^~~
gondola.cpp: In function 'int replacement(int, int*, int*)':
gondola.cpp:82:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   82 |     for(int i=0;i<s.size();i++)
      |                 ~^~~~~~~~~
gondola.cpp: In function 'int countReplacement(int, int*)':
gondola.cpp:152:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  152 |     for(int i=0;i<s.size();i++)
      |                 ~^~~~~~~~~
gondola.cpp:133:9: warning: variable 'diff' set but not used [-Wunused-but-set-variable]
  133 |     int diff=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