Submission #642769

#	Time	Username	Problem	Language	Result	Execution time	Memory
642769		andrei_boaca	Abracadabra (CEOI22_abracadabra)	C++14	10 / 100	1297 ms	524288 KiB

Main

#include <bits/stdc++.h>

using namespace std;
int n,q;
vector<int> v;
vector<vector<int>> vals;
vector<int> trans(vector<int> v)
{
    vector<int> a,b;
    for(int i=0;i<v.size();i++)
    {
        if(i*2<v.size())
            a.push_back(v[i]);
        else
            b.push_back(v[i]);
    }
    reverse(a.begin(),a.end());
    reverse(b.begin(),b.end());
    vector<int> rez;
    while(a.size()||b.size())
    {
        if(a.size()&&b.size())
        {
            int x=a.back();
            int y=b.back();
            rez.push_back(min(x,y));
            if(x<y)
                a.pop_back();
            else
                b.pop_back();
            continue;
        }
        if(a.size())
        {
            int x=a.back();
            a.pop_back();
            rez.push_back(x);
        }
        else
        {
            int x=b.back();
            b.pop_back();
            rez.push_back(x);
        }
    }
    return rez;
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cin>>n>>q;
    for(int i=1;i<=n;i++)
    {
        int x;
        cin>>x;
        v.push_back(x);
    }
    vals.push_back(v);
    while(true)
    {
        v=trans(v);
        vector<int> aux=vals.back();
        bool iseq=1;
        for(int i=0;i<v.size();i++)
            if(v[i]!=aux[i])
                iseq=0;
        if(iseq)
            break;
        vals.push_back(v);
    }
    assert(vals.size()<=n);
    while(q--)
    {
        int i,j;
        cin>>i>>j;
        int lg=vals.size();
        i=min(i,lg-1);
        cout<<vals[i][j-1]<<'\n';
    }
    return 0;
}

Compilation message (stderr)

Main.cpp: In function 'std::vector<int> trans(std::vector<int>)':
Main.cpp:10:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   10 |     for(int i=0;i<v.size();i++)
      |                 ~^~~~~~~~~
Main.cpp:12:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   12 |         if(i*2<v.size())
      |            ~~~^~~~~~~~~
Main.cpp: In function 'int main()':
Main.cpp:65:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   65 |         for(int i=0;i<v.size();i++)
      |                     ~^~~~~~~~~
In file included from /usr/include/c++/10/cassert:44,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:33,
                 from Main.cpp:1:
Main.cpp:72:23: warning: comparison of integer expressions of different signedness: 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   72 |     assert(vals.size()<=n);
      |            ~~~~~~~~~~~^~~

• Subtask 1: 10 / 10
• Subtask 2: 0 / 40
• Subtask 3: 0 / 25
• Subtask 4: 0 / 25