Submission #726102

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Source Code Expand

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.Closeable;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.HashMap;
import java.util.TreeMap;

public class Main {
	static ContestScanner in;static Writer out;public static void main(String[] args)
	{try{in=new ContestScanner();out=new Writer();Main solve=new Main();solve.solve(in,out);
	in.close();out.close();}catch(IOException e){e.printStackTrace();}}
	void dump(int[]a){for(int i=0;i<a.length;i++)out.print(a[i]+" ");out.println();}
	void dump(int[]a,int n){for(int i=0;i<a.length;i++)out.printf("%"+n+"d",a[i]);out.println();}
	void dump(long[]a){for(int i=0;i<a.length;i++)out.print(a[i]+" ");out.println();}
	void dump(char[]a){for(int i=0;i<a.length;i++)out.print(a[i]);out.println();}
	long pow(long a,int n){long r=1;while(n>0){if((n&1)==1)r*=a;a*=a;n>>=1;}return r;}
	String itob(int a,int l){return String.format("%"+l+"s",Integer.toBinaryString(a)).replace(' ','0');}
	void sort(int[]a){m_sort(a,0,a.length,new int[a.length]);}
	void m_sort(int[]a,int s,int sz,int[]b)
	{if(sz<7){for(int i=s;i<s+sz;i++)for(int j=i;j>s&&a[j-1]>a[j];j--)swap(a, j, j-1);return;}
	m_sort(a,s,sz/2,b);m_sort(a,s+sz/2,sz-sz/2,b);int idx=s;int l=s,r=s+sz/2;final int le=s+sz/2,re=s+sz;
	while(l<le&&r<re){if(a[l]>a[r])b[idx++]=a[r++];else b[idx++]=a[l++];}
	while(r<re)b[idx++]=a[r++];while(l<le)b[idx++]=a[l++];for(int i=s;i<s+sz;i++)a[i]=b[i];
	} /* qsort(3.5s)<<msort(9.5s)<<<shuffle+qsort(17s)<Arrays.sort(Integer)(20s) */
	void swap(int[] a,int i,int j){final int t=a[i];a[i]=a[j];a[j]=t;}
	int binarySearchSmallerMax(int[]a,int v)// get maximum index which a[idx]<=v
	{int l=0,r=a.length-1,s=0;while(l<=r){int m=(l+r)/2;if(a[m]>v)r=m-1;else{l=m+1;s=m;}}return a[s]>v?-1:s;}
	void solve(ContestScanner in,Writer out) throws NumberFormatException, IOException{
		int h = in.nextInt();
		int w = in.nextInt();
		int[][] map = new int[h][w];
		for(int i=0; i<h; i++){
			for(int j=0; j<w; j++){
				map[i][j] = in.nextInt();
			}
		}
		long res = getMax(h, w, map);
		int[][] smap = new int[w][h];
		for(int i=0; i<h; i++){
			for(int j=0; j<w; j++){
				smap[j][i] = map[i][j];
			}
		}
		res = Math.max(res, getMax(w, h, smap));
		System.out.println(res);
	}
	
	long getMax(int h, int w, int[][] map){
		long[][] sum = new long[h][w];
		for(int i=0; i<h; i++){
			for(int j=0; j<w; j++){
				sum[i][j] = map[i][j];
			}
		}
		for(int j=0; j<w; j++){
			for(int i=1; i<h; i++){
				sum[i][j] += sum[i-1][j];
			}
		}
		long[][] dp = new long[h][h];
		long[][] rowMax = new long[h][h];
		for(int i=0; i<h; i++){
			long imax = Long.MIN_VALUE;
			for(int j=i; j<h; j++){
				long max = Long.MIN_VALUE;
				long s = 0;
				for(int k=0; k<w; k++){
					long col = sum[j][k] - (i>0?sum[i-1][k]:0);
					s = Math.max(col, s+col);
					max = Math.max(max, s);
				}
				imax = Math.max(imax, max);
				dp[i][j] = imax;
				rowMax[i][j] = max;
			}
		}
		for(int i=h-1; i>=0; i--){
			long rm = Long.MIN_VALUE;
			for(int j=i; j>=0; j--){
				rm = Math.max(rowMax[j][i], rm);
				dp[j][i] = Math.max(dp[j][i], rm);
			}
		}
		for(int i=0; i<h; i++){
			long rm = Long.MIN_VALUE;
			for(int j=i; j<h; j++){
				rm = Math.max(dp[i][j], rm);
				dp[i][j] = Math.max(dp[i][j], rm);
			}
		}
		for(int i=h-1; i>=0; i--){
			for(int j=i; j>=0; j--){
				dp[j][i] = Math.max(dp[j][i], rowMax[j][i]);
			}
		}
		long max = Long.MIN_VALUE;
		for(int i=0; i<h-1; i++){
			max = Math.max(max, dp[0][i]+dp[i+1][h-1]);
		}
		return max;
	}
}

class MultiSet<T> extends HashMap<T, Integer>{
	@Override
	public Integer get(Object key){return containsKey(key)?super.get(key):0;}
	public void add(T key,int v){put(key,get(key)+v);}
	public void add(T key){put(key,get(key)+1);}
	public void sub(T key)
	{final int v=get(key);if(v==1)remove(key);else put(key,v-1);}
}
class OrderedMultiSet<T> extends TreeMap<T, Integer>{
	@Override
	public Integer get(Object key){return containsKey(key)?super.get(key):0;}
	public void add(T key,int v){put(key,get(key)+v);}
	public void add(T key){put(key,get(key)+1);}
	public void sub(T key)
	{final int v=get(key);if(v==1)remove(key);else put(key,v-1);}
}
class Pair implements Comparable<Pair>{
	int a,b;int hash;Pair(int a,int b){this.a=a;this.b=b;hash=(a<<16|a>>16)^b;}
	public boolean equals(Object obj){Pair o=(Pair)(obj);return a==o.a&&b==o.b;}
	public int hashCode(){return hash;}
	public int compareTo(Pair o){if(a!=o.a)return a<o.a?-1:1;else if(b!=o.b)return b<o.b?-1:1;return 0;}
}
class Timer{
	long time;
	public void set(){time=System.currentTimeMillis();}
	public long stop(){return time=System.currentTimeMillis()-time;}
	public void print()
	{System.out.println("Time: "+(System.currentTimeMillis()-time)+"ms");}
	@Override public String toString(){return"Time: "+time+"ms";}
}
class Writer extends PrintWriter{
	public Writer(String filename)throws IOException
	{super(new BufferedWriter(new FileWriter(filename)));}
	public Writer()throws IOException{super(System.out);}
}
class ContestScanner implements Closeable{
	private BufferedReader in;private int c=-2;
	public ContestScanner()throws IOException 
	{in=new BufferedReader(new InputStreamReader(System.in));}
	public ContestScanner(String filename)throws IOException
	{in=new BufferedReader(new InputStreamReader(new FileInputStream(filename)));}
	public String nextToken()throws IOException {
		StringBuilder sb=new StringBuilder();
		while((c=in.read())!=-1&&Character.isWhitespace(c));
		while(c!=-1&&!Character.isWhitespace(c)){sb.append((char)c);c=in.read();}
		return sb.toString();
	}
	public String readLine()throws IOException{
		StringBuilder sb=new StringBuilder();if(c==-2)c=in.read();
		while(c!=-1&&c!='\n'&&c!='\r'){sb.append((char)c);c=in.read();}
		return sb.toString();
	}
	public long nextLong()throws IOException,NumberFormatException
	{return Long.parseLong(nextToken());}
	public int nextInt()throws NumberFormatException,IOException
	{return(int)nextLong();}
	public double nextDouble()throws NumberFormatException,IOException 
	{return Double.parseDouble(nextToken());}
	public void close() throws IOException {in.close();}
}

Submission Info

Judge Result