Submission #8373

#	Time	Username	Problem	Language	Result	Execution time	Memory
8373		cki86201	On grid (kriii2_O)	C++98	0 / 4	0 ms	3240 KiB

O

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

//O(R^2 * C^2)
int d[303][303];
int p[303][303];
int b[2][303][606], t;
#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=2;i<=r+c;i++,t^=1){
		for(j=max(1,i-c);j<=min(i-1,r);j++){
			d[j][i-j] = d[j-1][i-j-1] + Get(j,i-j,j,i-j), b[t][j][i] = j;
			for(int k=i-1;k>=2;k--){
				int L = max(1, k-c), R = min(k-1, r);
				for(int l=max(L,b[!t][j-1][k]);l<=min(R,b[!t][j][k]?b[!t][j][k]:400);++l){
					int a = d[l-1][k-l-1] + Get(l,k-l,j,i-j);
					if(d[j][i-j] < a)d[j][i-j] = a, b[t][j][k] = l;
				}
			}
		}
		memset(b[!t], 0, sizeof b[!t]);
	}
	printf("%d",d[r][c]);
	return 0;
}

• Subtask 1: 0 / 1
• Subtask 2: 0 / 3