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• state: f[x][y]从起点走到x,y的最短路径• function: f[x][y] = min(f[x-1][y], f[x][y-1]) + A[x][y]• intialize: f[i][0] = sum(0,0 ~ i,0) f[0][i] = sum(0,0 ~ 0,i)• answer: f[n-1][m-1]
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