Submission #200232

#	Time	Username	Problem	Language	Result	Execution time	Memory
200232		mdn2002	Growing Vegetable is Fun 3 (JOI19_ho_t3)	C++14	75 / 100	510 ms	64812 KiB

joi2019_ho_t3

#include<bits/stdc++.h>
using namespace std;
const int mod=1e9+7;
int n,dp[4][232][133][133];
vector<int>v[4];
string s;
int f(int x,int ir,int ig,int iy)
{
    if(ir+ig+iy==n)return 0;
    if(dp[x][ir][ig][iy]!=-1)return dp[x][ir][ig][iy];
    int ans=1e9,ind=ir+ig+iy,id;
    for(int i=0;i<3;i++)
    {
        if(i==x)continue;
        if(i==0)
        {
            if(ir==v[0].size())continue;
            int id=v[i][ir],ad=0;
            ad-=lower_bound(v[1].begin(),v[1].begin()+ig,id)-v[1].begin();
            ad+=ig;
            ad-=lower_bound(v[2].begin(),v[2].begin()+iy,id)-v[2].begin();
            ad+=iy;
            ans=min(ans,f(0,ir+1,ig,iy)+abs((id+ad)-ind));
        }
        if(i==1)
        {
            if(ig==v[1].size())continue;
            int id=v[i][ig],ad=0;
            ad-=lower_bound(v[0].begin(),v[0].begin()+ir,id)-v[0].begin();
            ad+=ir;
            ad-=lower_bound(v[2].begin(),v[2].begin()+iy,id)-v[2].begin();
            ad+=iy;
            ans=min(ans,f(1,ir,ig+1,iy)+abs((id+ad)-ind));
        }
        if(i==2)
        {
            if(iy==v[2].size())continue;
            int id=v[i][iy],ad=0;
            ad-=lower_bound(v[1].begin(),v[1].begin()+ig,id)-v[1].begin();
            ad+=ig;
            ad-=lower_bound(v[0].begin(),v[0].begin()+ir,id)-v[0].begin();
            ad+=ir;
            ans=min(ans,f(2,ir,ig,iy+1)+abs((id+ad)-ind));
        }
    }
    return dp[x][ir][ig][iy]=ans;
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    //freopen("dec.in","r",stdin);
    //freopen("dec.out","w",stdout);
    memset(dp,-1,sizeof dp);
    cin>>n>>s;
    for(int i=0;i<n;i++)
    {
        if(s[i]=='R')v[0].push_back(i);
        if(s[i]=='G')v[1].push_back(i);
        if(s[i]=='Y')v[2].push_back(i);
    }
    int mx=max(v[0].size(),max(v[1].size(),v[2].size()));
    if(mx-1>n-mx)
    {
        cout<<-1;
        return 0;
    }
    for(int i=1;i<3;i++)
    {
        if(v[0].size()<v[i].size())swap(v[0],v[i]);
    }
    int ans=f(3,0,0,0);
    cout<<ans;
}

Compilation message (stderr)

joi2019_ho_t3.cpp: In function 'int f(int, int, int, int)':
joi2019_ho_t3.cpp:17:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             if(ir==v[0].size())continue;
                ~~^~~~~~~~~~~~~
joi2019_ho_t3.cpp:27:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             if(ig==v[1].size())continue;
                ~~^~~~~~~~~~~~~
joi2019_ho_t3.cpp:37:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             if(iy==v[2].size())continue;
                ~~^~~~~~~~~~~~~
joi2019_ho_t3.cpp:11:30: warning: unused variable 'id' [-Wunused-variable]
     int ans=1e9,ind=ir+ig+iy,id;
                              ^~

• Subtask 1: 5 / 5
• Subtask 2: 55 / 55
• Subtask 3: 15 / 15
• Subtask 4: 0 / 25