48 lines
1.3 KiB
C++
48 lines
1.3 KiB
C++
#include <iostream>
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#include <cstdio>
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#include <cstring>
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#include <algorithm>
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using namespace std;
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#define CLR(x) memset(x, 0, sizeof(x))
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int n, m;
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int d[505][505][2];
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int x[505][505][2];
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int nor[505][505], wes[505][505];
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void init()
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{
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for (int t = 0; t < 2; ++ t)
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for (int i = 0; i < n; ++ i)
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for (int j = 0; j < m; ++ j)
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scanf ("%d", &x[i][j][t]);
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CLR (nor); CLR (wes);
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for (int i = 0; i < n; ++ i)
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for (int j = 0; j < m; ++ j){
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wes[i][j] = (j ? x[i][j][0]+wes[i][j-1] : x[i][j][0]);
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nor[i][j] = (i ? x[i][j][1]+nor[i-1][j] : x[i][j][1]);
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}
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}
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int DP()
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{
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CLR (d);
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d[0][0][0] = x[0][0][0]; d[0][0][1] = x[0][0][1];
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for (int i = 0; i < n; ++ i)
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for (int j = 0; j < m; ++ j){
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if (!i && !j) continue;
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d[i][j][0] = wes[i][j];
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if (i)
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d[i][j][0] += max(d[i-1][j][0], d[i-1][j][1]);
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d[i][j][1] = nor[i][j];
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if (j)
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d[i][j][1] += max(d[i][j-1][0], d[i][j-1][1]);
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}
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return max(d[n-1][m-1][0], d[n-1][m-1][1]);
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}
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int main()
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{
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while (scanf ("%d%d", &n, &m) != EOF && n){
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init();
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printf ("%d\n", DP());
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}
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return 0;
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}
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