Submission #333654

#	Time	Username	Problem	Language	Result	Execution time	Memory
333654		vipghn2003	Red-blue table (IZhO19_stones)	C++14	53 / 100	105 ms	2156 KiB

stones

#include<bits/stdc++.h>
#define pii pair<int,int>
#define fi first
#define se second
#define mp make_pair
using namespace std;

const int N=1005;
int n,m;
char ans[N][N];

void solve()
{
    int res=0;
    int del=0;
    for(int row_del=0;row_del<=n;row_del++)
    {
        int can=(m-1)/2;
        int need=max(0,n-(n-1)/2-row_del);
        if(need==0)
        {
            if(res<m+n-row_del)
            {
                res=m+n-row_del;
                del=row_del;
            }
            continue;
        }
        if(res<n-row_del+min(m,((n-row_del)/need)*can))
        {
            res=n-row_del+min(m,((n-row_del)/need)*can);
            del=row_del;
        }
    }
    for(int i=1;i<=n;i++)
    {
        for(int j=1;j<=m;j++) ans[i][j]='+';
    }
    for(int i=n-del+1;i<=n;i++)
    {
        for(int j=1;j<=m;j++) ans[i][j]='-';
    }
    set<pii>cur;
    cur.clear();
    for(int j=1;j<=m;j++) if(del<=n-del) cur.insert(mp(del,j));
    for(int i=1;i<=n-del;i++)
    {
        vector<pii>u;
        int can=(m-1)/2;
        while(!cur.empty()&&can)
        {
            can--;
            auto x=*cur.rbegin();
            cur.erase(x);
            int col=x.se;
            ans[i][col]='-';
            if(x.fi+1>(n-x.fi-1)) continue;
            u.push_back(mp(x.fi+1,x.se));
        }
        for(auto&x:u) cur.insert(x);
    }
    cout<<res<<'\n';
    for(int i=1;i<=n;i++)
    {
        for(int j=1;j<=m;j++) cout<<ans[i][j];
        cout<<'\n';
    }
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    int t;
    cin>>t;
    while(t--)
    {
        cin>>n>>m;
        solve();
    }
}

• Subtask 1: 17 / 17
• Subtask 2: 10 / 10
• Subtask 3: 0 / 16
• Subtask 4: 11 / 11
• Subtask 5: 15 / 15
• Subtask 6: 0 / 31