60 lines
1.9 KiB
C++
60 lines
1.9 KiB
C++
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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int n, m;
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int map[101][101];
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int hash[2][101][101][2];
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bool vis[101];
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int f[2];
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int abs(int a){
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if (a < 0) return -a;
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return a;
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}
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int main(){
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int i, j, k, t, ii, ans;
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int *p;
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while(scanf("%d%d", &n, &m) != EOF){
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for (i = 1; i <= n; i++)
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for (j = 1; j <= m; j++)
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scanf("%d", &map[i][j]);
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memset(vis, 0, sizeof(vis));
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ans = 0x80000000;
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ii = 0;
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for (i = 1; i <= n; i++){
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ii = 1 - ii;
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for (j = 1; j <= m; j++){
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f[0] = f[1] = 0x80000000;
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for (k = 100; k >= 0; k--){
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for (t = 0; t <= 1; t++){
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p = & hash[ii][j][k][t];
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*p = 0x80000000;
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if (!vis[k]) continue;
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if (i > 1 && *p < hash[1 - ii][j][k][t])
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*p = hash[1 - ii][j][k][t];
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if (j > 1 && *p < hash[ii][j - 1][k][t])
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*p = hash[ii][j - 1][k][t];
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if (k <= abs(map[i][j])) continue;
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if (f[1 - t] < *p) f[1 - t] = *p;
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}
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}
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if (f[0] == 0x80000000) f[0] = 0;
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if (f[1] == 0x80000000) f[1] = 0;
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f[0] = map[i][j] - f[0];
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f[1] = map[i][j] - f[1];
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if (ans < f[0]) ans = f[0];
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k = abs(map[i][j]);
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if (!vis[k] || hash[ii][j][k][0] < f[0]){
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vis[k] = 1;
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hash[ii][j][k][0] = f[0];
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}
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if (!vis[k] || hash[ii][j][k][1] < f[1]){
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vis[k] = 1;
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hash[ii][j][k][1] = f[1];
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}
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}
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}
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printf("%d\n", ans);
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}
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return 0;
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}
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