java Uva108.java

Posted 2021-05-08

import java.util.*;
public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner scanner = new Scanner(System.in);
		
		while(scanner.hasNext()){
			int n = scanner.nextInt();
			
			int input[][] = new int[n+1][n+1];
			for(int i=1;i<=n;i++){
				for(int j=1;j<=n;j++){
					input[i][j] = scanner.nextInt();
				}
			}
			
			int sumTable[][] = new int[n+1][n+1];
			
			for(int i=1;i<=n;i++){
				for(int j=1;j<=n;j++){
					sumTable[i][j] = sumTable[i-1][j] + input[i][j];
				}
			}
			
			int maxSum = Integer.MIN_VALUE;
			for(int i=1;i<=n;i++){
				for(int j=i;j<=n;j++){
					int sum = 0;
					for(int k=1;k<=n;k++){
						sum+= sumTable[j][k] - sumTable[i-1][k];
						if(sum > maxSum){
							maxSum = sum;
						}
						if(sum < 0){
							sum = 0;
						}
					}
				}
			}
			
			System.out.println(maxSum);
			
		}
		
	}

}