Submission #940486

#	Time	Username	Problem	Language	Result	Execution time	Memory
940486		andrei_boaca	Sightseeing in Kyoto (JOI22_kyoto)	C++17	10 / 100	186 ms	355740 KiB

kyoto

#include <bits/stdc++.h>

using namespace std;
ofstream fout("date.out");
mt19937 rng(chrono::steady_clock().now().time_since_epoch().count());
typedef long long ll;
const ll INF=1e17;
ll n,m;
ll A[100005],B[100005];
vector<vector<ll>> dp;
ll from[10005][10005];
string dig(ll x)
{
    string s;
    while(x!=0)
    {
        s.push_back(char('0'+x%10));
        x/=10;
    }
    while(s.size()<4)
        s.push_back('0');
    reverse(s.begin(),s.end());
    return s;
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    vector<ll> lins,cols;
    ll minA=INF,minB=INF;
    cin>>n>>m;
    for(int i=1;i<=n;i++)
    {
        //A[i]=A[i-1]+rng()%100+1;
        cin>>A[i];
        minA=min(minA,A[i]);
    }
    for(int i=1;i<=m;i++)
    {
        //B[i]=B[i-1]+rng()%100+1;
        cin>>B[i];
        minB=min(minB,B[i]);
    }
    ll minim=INF;
    for(int i=n;i>=1;i--)
    {
        if(A[i]<minim)
        {
            lins.push_back(i);
            minim=min(minim,A[i]);
        }
    }
    minim=INF;
    for(int i=m;i>=1;i--)
    {
        if(B[i]<minim)
        {
            cols.push_back(i);
            minim=min(minim,B[i]);
        }
    }
    minim=INF;
    for(int i=1;i<=n;i++)
        if(A[i]<minim)
        {
            lins.push_back(i);
            minim=A[i];
        }
    minim=INF;
    for(int i=1;i<=m;i++)
        if(B[i]<minim)
        {
            cols.push_back(i);
            minim=B[i];
        }
    sort(lins.begin(),lins.end());
    sort(cols.begin(),cols.end());
    lins.erase(unique(lins.begin(),lins.end()),lins.end());
    cols.erase(unique(cols.begin(),cols.end()),cols.end());
    dp.clear();
    dp.resize(lins.size());
    for(int i=0;i<lins.size();i++)
        dp[i].resize(cols.size());
    for(int i=0;i<lins.size();i++)
        for(int j=0;j<cols.size();j++)
            if(i!=0||j!=0)
            {
                dp[i][j]=INF;
                if(i>0&&dp[i-1][j]+B[cols[j]]*(lins[i]-lins[i-1])<dp[i][j])
                {
                    dp[i][j]=min(dp[i][j],dp[i-1][j]+B[cols[j]]*(lins[i]-lins[i-1]));
                    from[i][j]=1;
                }
                if(j>0&&dp[i][j-1]+A[lins[i]]*(cols[j]-cols[j-1])<dp[i][j])
                {
                    dp[i][j]=min(dp[i][j],dp[i][j-1]+A[lins[i]]*(cols[j]-cols[j-1]));
                    from[i][j]=2;
                }
            }
    ll ans=dp[(int)lins.size()-1][(int)cols.size()-1];
    cout<<ans;
    int i=(int)lins.size()-1;
    int j=(int)cols.size()-1;
    int prv=0;
    int changes=0;
    while(i!=0||j!=0)
    {
        if(from[i][j]!=prv&&prv!=0)
            changes++;
        prv=from[i][j];
        if(from[i][j]==1)
            i--;
        else
            j--;
    }
    assert(changes<=300);
    return 0;
}

Compilation message (stderr)

kyoto.cpp: In function 'int main()':
kyoto.cpp:82:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   82 |     for(int i=0;i<lins.size();i++)
      |                 ~^~~~~~~~~~~~
kyoto.cpp:84:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   84 |     for(int i=0;i<lins.size();i++)
      |                 ~^~~~~~~~~~~~
kyoto.cpp:85:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   85 |         for(int j=0;j<cols.size();j++)
      |                     ~^~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 0 / 30
• Subtask 3: 0 / 60