Submission #9827

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
9827	2014-09-28 12:49:16	veckal	On grid (kriii2_O)	C++14	4 / 4	464 ms	107612 KiB

O

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#include<stdio.h>
#include<string.h>
int r, c, grid[300][300], psum[300][300];
int cache[300][300], reCache[300][300][300];
inline int max(int a, int b) {
  return (a>b)?a:b;
}
int reverseGrid(int, int, int);
int onGrid(int y, int x) {
  int &ret = cache[y][x];
  if (~ret) return ret;
  ret = psum[y][x];
  if (!y || !x) return ret;
  for (int h=0; h<y; ++h)
    ret = max(ret, reverseGrid(y, x-1, h) + psum[y][x] - psum[h][x] - psum[y][x-1] + psum[h][x-1]);
  return ret;
}
int reverseGrid(int y, int x, int h) {
  int &ret = reCache[y][x][h];
  if (~ret) return ret;
  ret = onGrid(h, x);
  if (x == 0) return ret;
  int smallGrid = psum[y][x] - psum[h][x] - psum[y][x-1] + psum[h][x-1];
  ret = max(ret, reverseGrid(y, x-1, h) + smallGrid);
  ret = max(ret, onGrid(h, x-1) + smallGrid);
 
 
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• Subtask 1: 1 / 1
• Subtask 2: 3 / 3