Submission #930065

#	Time	Username	Problem	Language	Result	Execution time	Memory
930065		abcvuitunggio	Soccer Stadium (IOI23_soccer)	C++17	19.50 / 100	422 ms	246528 KiB

soccer

#include "soccer.h"
#include <bits/stdc++.h>
using namespace std;
const int mxn=2006;
int n,res,dp[mxn][mxn],l[mxn][mxn],u[mxn][mxn],d[mxn][mxn],ch[mxn][mxn],a[mxn][mxn],b[mxn][mxn];
vector <int> ve[mxn][mxn];
vector <vector <int>> tmp;
int f(int i, int j){
    if (dp[i][j]!=-1)
        return dp[i][j];
    dp[i][j]=0;
    int sz=j-l[i][j]+1;
    for (int k:ve[i][j])
        dp[i][j]=max(dp[i][j],f(k,j)-sz*(d[k][j]-u[k][j]+1));
    if (j<n-1&&!tmp[i][j+1])
        dp[i][j]=max(dp[i][j],f(i,j+1)-sz*(d[i][j+1]-u[i][j+1]+1));
    dp[i][j]+=sz*(d[i][j]-u[i][j]+1);
    return dp[i][j];
}
int biggest_stadium(int N, vector <vector <int>> F){
    n=N,tmp=F;
    for (int i=0;i<n;i++)
        for (int j=0;j<n;j++){
            l[i][j]=(j&&!F[i][j-1]?l[i][j-1]:j);
            d[i][j]=n-1;
        }
    memset(a,-1,sizeof(a));
    memset(b,-1,sizeof(b));
    for (int j=0;j<n;j++){
        stack <int> st;
        for (int i=0;i<n;i++){
            if (F[i][j]){
                while (!st.empty()){
                    d[st.top()][j]=i-1;
                    st.pop();
                }
                continue;
            }
            while (!st.empty()&&l[i][j]>l[st.top()][j]){
                d[st.top()][j]=i-1;
                st.pop();
            }
            if (!st.empty()){
                if (l[i][j]==l[st.top()][j]){
                    a[i][j]=st.top();
                    continue;
                }
                ve[st.top()][j].push_back(i);
            }
            ch[i][j]=1;
            st.push(i);
        }
        while (!st.empty())
            st.pop();
        for (int i=n-1;i>=0;i--){
            if (F[i][j]){
                while (!st.empty()){
                    u[st.top()][j]=i+1;
                    st.pop();
                }
                continue;
            }
            while (!st.empty()&&l[i][j]>l[st.top()][j]){
                u[st.top()][j]=i+1;
                st.pop();
            }
            if (!st.empty()){
                if (l[i][j]==l[st.top()][j]){
                    b[i][j]=st.top();
                    continue;
                }
                ve[st.top()][j].push_back(i);
            }
            ch[i][j]=1;
            st.push(i);
        }
    }
    for (int i=0;i<n;i++)
        for (int j=0;j<n;j++){
            if (a[i][j]>=0)
                d[i][j]=d[a[i][j]][j];
            if (b[i][j]>=0)
                u[i][j]=u[b[i][j]][j];
        }
    memset(dp,-1,sizeof(dp));
    int ans=0;
    for (int i=0;i<n;i++)
        for (int j=0;j<n;j++)
            if (ch[i][j])
                ans=max(ans,f(i,j));
    return ans;
}

• Subtask 0: 0 / 0
• Subtask 1: 6 / 6
• Subtask 2: 8 / 8
• Subtask 3: 5.5 / 22
• Subtask 4: 0 / 18
• Subtask 5: 0 / 16
• Subtask 6: 0 / 30