Submission #8368

#	Time	Username	Problem	Language	Result	Execution time	Memory
8368		cki86201	On grid (kriii2_O)	C++98	0 / 4	0 ms	2520 KiB

O

#include<stdio.h>
#include<algorithm>
using namespace std;

//O(R^2 * C^2)
int d[303][303];
int p[303][303], b[303][303][2];
#define Get(a,b,c,d) (p[c][d]-p[a-1][d]-p[c][b-1]+p[a-1][b-1])

int main(){
	int r,c,i,j;
	scanf("%d%d",&r,&c);
	for(i=1;i<=r;i++)for(j=1;j<=c;j++)scanf("%d",p[i]+j);
	for(i=1;i<=r;i++)for(j=1;j<=c;j++)p[i][j] += p[i][j-1] + p[i-1][j] - p[i-1][j-1];
	for(i=0;i<=r;i++)for(j=0;j<=c;j++)d[i][j] = (i||j) * (-1e9);
	for(i=1;i<=r;i++)for(j=1;j<=c;j++){
		int k, l;
		for(k=max(1,b[i-1][j][0]);k<=i;k++)for(l=max(1,b[i][j-1][1]);l<=j;l++){
			int t = d[k-1][l-1] + Get(k, l, i, j);
			if(d[i][j] < t)d[i][j] = t, b[i][j][0] = k, b[i][j][1] = l;
		}
	}
	printf("%d",d[r][c]);
	return 0;
}

• Subtask 1: 0 / 1
• Subtask 2: 0 / 3