Submission #9711

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
9711	2014-09-28 08:18:09	shashack	On grid (kriii2_O)	C++98	1 / 4	1000 ms	3340 KiB

O

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#include <cstdio>
#include <algorithm>
using namespace std;
typedef long long ll;
int row, col;
const ll INF=9876543210000;
ll data[310][310], psum[310][310], cache[310][310];
ll get_psum(int sx, int sy, int ex, int ey)
{
  ll ret = psum[ex][ey] - psum[sx-1][ey] - psum[ex][sy-1] + psum[sx-1][sy-1];
  return ret;
}
ll solution(int x, int y)
{
  if(x==row+1 && y==col+1) return 0;
  else if(x==row+1 || y==col+1) return -INF;
  ll& ret=cache[x][y];
  if(ret!=-INF) return ret;
  for(int i=x ; i<=row ; i++)
    for(int j=y ; j<=col ; j++)
      ret=max(ret, solution(i+1, j+1)+get_psum(x, y, i, j));
  return ret;
 
 
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