比赛 2022级DP专题练习赛1 评测结果 AAAAAAAAAA
题目名称 棋盘制作 最终得分 100
用户昵称 op_组撒头屯 运行时间 1.180 s
代码语言 C++ 内存使用 46.95 MiB
提交时间 2023-02-10 20:25:14
显示代码纯文本
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ull unsigned long long
#define ld long double
#define pii pair<int,int>
#define vi vector<int>
#define si set<int>
#define unsi unordered_set<int>
#define qi queue<int>
#define sti stack<int>
#define pqi priority_queue<int>
#define mii map<int,int>
#define unmii unordered_map<int,int>
#define fi first
#define se second
#define pb push_back
#define clr(f,n) memset(f,0,sizeof(int)*(n))
#define cpy(f,g,n) memcpy(f,g,sizeof(int)*(n))
const int N=2000+5;
int n,m;
int a[N][N],f[N][N];
int l[N][N],r[N][N];
int main(){
	freopen ("makechess.in","r",stdin);
	freopen ("makechess.out","w",stdout);
	scanf("%d%d",&n,&m);
	for (int i=1;i<=n;i++){
	    for (int j=1;j<=m;j++){
	        scanf("%d",&a[i][j]);
	        l[i][j]=r[i][j]=j;
        }
    }
    for (int i=1;i<=m;i++)f[n][i]=1;
    for (int i=n-1;i>=1;i--){
        for (int j=1;j<=m;j++){
            if (a[i][j]==a[i+1][j])f[i][j]=1;
            else f[i][j]=f[i+1][j]+1;
        }
    }
    int ans1=0,ans2=0;
    for (int i=1;i<=n;i++){
        for (int j=1;j<=m;j++)while(f[i][l[i][j]-1]>=f[i][j]&&a[i][l[i][j]-1]!=a[i][l[i][j]])l[i][j]=l[i][l[i][j]-1];
        for (int j=m;j>=1;j--)while(f[i][r[i][j]+1]>=f[i][j]&&a[i][r[i][j]+1]!=a[i][r[i][j]])r[i][j]=r[i][r[i][j]+1];
        for (int j=1;j<=m;j++){
            ans1=max(ans1,(r[i][j]-l[i][j]+1)*f[i][j]);
            int b=min(r[i][j]-l[i][j]+1,f[i][j]);
            ans2=max(ans2,b*b);
        }
    }
    printf("%d\n%d\n",ans2,ans1);
    return 0;
}