Submission #16512

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
16512	2015-08-27 00:25:16	hongjun7	On grid (kriii2_O)	C++98	4 / 4	79 ms	2172 KiB

O

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#include <stdio.h>
#define MN 305
#define max(a, b) ((a)>(b)?(a):(b))
const int oo = 1e9;
int n, m, x, c[MN][MN], d[MN][MN], f[MN][MN];
int main() {
  scanf("%d%d", &n, &m);
  for (int i = 1; i <= n; i++) {
    for (int j = 1; j <= m; j++) {
      scanf("%d", &x);
      c[i][j] = x + c[i - 1][j] + c[i][j - 1] - c[i - 1][j - 1];
    }
  }
  for (int i = 0; i <= n; i++) for (int j = 0; j <= n; j++) f[i][j] = -oo;
  for (int j = 1; j <= m; j++) {
    for (int i = n; i >= 1; i--) {
      d[i][j] = c[i][j];
      for (int k = 0; k < i; k++) d[i][j] = max(d[i][j], f[k][i] + c[i][j] - c[k][j]);
      for (int k = i + 1; k <= n; k++) f[i][k] = max(f[i][k], d[i][j] - c[k][j] + c[i][j]);
    }
  }
  printf("%d", d[n][m]);
}
 
 
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• Subtask 1: 1 / 1
• Subtask 2: 3 / 3