Submission #1030019

#	Time	Username	Problem	Language	Result	Execution time	Memory
1030019		MMihalev	Swap (BOI16_swap)	C++14	68 / 100	315 ms	262144 KiB

swap

#include<iostream>
#include<algorithm>
#include<iomanip>
#include<cmath>
#include<cstring>
#include<vector>
#include<queue>
#include<stack>
#include<tuple>
#include<set>
#include<map>
#include<random>
#include<chrono>
#include<array>
#include<unordered_map>
using namespace std;
const int MAX_N=2e5+5;
const int LOG=18;
vector<int>dp[MAX_N][LOG][2],tmp1,tmp2;
bool need[MAX_N][LOG][2];
int a[MAX_N];
int n;
void Merge(vector<int>& res,vector<int>& Left,vector<int>& Right)
{
    int nums=1;
    int idxL=0;
    int idxR=0;
    while(idxL<Left.size() or idxR<Right.size())
    {
        int cur=nums;
        while(idxL<Left.size() && cur--)res.push_back(Left[idxL++]);
        cur=nums;
        while(idxR<Right.size() && cur--)res.push_back(Right[idxR++]);
        nums*=2;
    }
}
signed main ()
{
    ios_base::sync_with_stdio(0);
    cin.tie(NULL);
    cout.tie(NULL);
    cin>>n;
    for(int i=1;i<=n;i++)
    {
        cin>>a[i];
    }

    a[n+1]=1e9;

    need[1][0][1]=1;
    for(int node=1;node<=n/2;node++)
    {
        for(int i=0;node>>i;i++)
        {
            for(int j:{0,1})
            {
                if(!need[node][i][j])continue;

                int idx=((node>>i+1)<<1)+j;
                int mn=min(a[2*node+1],min(a[idx],a[2*node]));
                if(a[idx]==mn)
                {
                    need[2*node][0][0]=1;
                    need[2*node+1][0][1]=1;
                }
                else if(a[2*node]==mn)
                {
                    need[2*node][i+1][j]=1;
                    need[2*node+1][0][1]=1;
                }
                else
                {
                    need[2*node][i+1][j]=1;
                    need[2*node+1][0][0]=1;

                    need[2*node][0][0]=1;
                    need[2*node+1][i+1][j]=1;
                }
            }
        }
    }


    for(int node=n;node>=1;node--)
    {
        for(int i=0;node>>i;i++)
        {
            for(int j:{0,1})
            {
                //if(!need[node][i][j])continue;

                int idx=((node>>i+1)<<1)+j;

                if(2*node>n)
                {
                    dp[node][i][j].push_back(a[idx]);
                }
                else if(2*node==n)
                {
                    dp[node][i][j].push_back(min(a[idx],a[2*node]));
                    dp[node][i][j].push_back(max(a[idx],a[2*node]));
                }
                else
                {
                    if(a[idx]<min(a[2*node],a[2*node+1]))
                    {
                        dp[node][i][j].push_back(a[idx]);
                        Merge(dp[node][i][j],dp[2*node][0][0],dp[2*node+1][0][1]);
                    }
                    else if(a[2*node]<min(a[idx],a[2*node+1]))
                    {
                        dp[node][i][j].push_back(a[2*node]);
                        Merge(dp[node][i][j],dp[2*node][i+1][j],dp[2*node+1][0][1]);
                    }
                    else
                    {
                        tmp1=tmp2={a[2*node+1]};
                        Merge(tmp1,dp[2*node][0][0],dp[2*node+1][i+1][j]);
                        Merge(tmp2,dp[2*node][i+1][j],dp[2*node+1][0][0]);
                        dp[node][i][j]=min(tmp1,tmp2);
                    }
                }
            }
        }
        if(2*node<n)
        {
            for(int i=0;node>>i;i++)
            {
                for(int j:{0,1})
                {
                    vector<int>().swap(dp[2*node][i][j]);
                    vector<int>().swap(dp[2*node+1][i][j]);
                }
            }
        }
    }

    for(int x:dp[1][0][1])cout<<x<<" ";
    cout<<"\n";

    return 0;
}

Compilation message (stderr)

swap.cpp: In function 'void Merge(std::vector<int>&, std::vector<int>&, std::vector<int>&)':
swap.cpp:28:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   28 |     while(idxL<Left.size() or idxR<Right.size())
      |           ~~~~^~~~~~~~~~~~
swap.cpp:28:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   28 |     while(idxL<Left.size() or idxR<Right.size())
      |                               ~~~~^~~~~~~~~~~~~
swap.cpp:31:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   31 |         while(idxL<Left.size() && cur--)res.push_back(Left[idxL++]);
      |               ~~~~^~~~~~~~~~~~
swap.cpp:33:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   33 |         while(idxR<Right.size() && cur--)res.push_back(Right[idxR++]);
      |               ~~~~^~~~~~~~~~~~~
swap.cpp: In function 'int main()':
swap.cpp:59:34: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   59 |                 int idx=((node>>i+1)<<1)+j;
      |                                 ~^~
swap.cpp:92:34: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   92 |                 int idx=((node>>i+1)<<1)+j;
      |                                 ~^~

• Subtask 1: 10 / 10
• Subtask 2: 11 / 11
• Subtask 3: 27 / 27
• Subtask 4: 20 / 20
• Subtask 5: 0 / 32