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Standard 2D DP for min-cost path with right/down moves only:
dp[i][j] = min(dp[i-1][j], dp[i][j-1]) + cost[i][j]
cost: dp:
1 3 1 2 1 4 5 7
1 5 1 3 2 7 6 9
4 2 1 4 6 8 7 11
1 6 2 3 7 13 9 12
Optimal cost from (0,0) to (3,3) = 12.
Tests nested 2D arrays via Array.init + Array.make, double-nested
for-loops with branched edges (first row, first column, general),
mixed .(i-1).(j) read + .(i).(j)<- write on the same DP array.
161 baseline programs total.