daily:1289

solution/1289/main.go

@@ -0,0 +1,45 @@
+package main
+
+package main
+
+import (
+	"math"
+)
+
+type Triplet struct {
+	minSum       int
+	secondMinSum int
+	minSumIndex  int
+}
+
+func minFallingPathSum(grid [][]int) int {
+	return minFallingPathSumHelper(0, grid).minSum
+}
+
+func minFallingPathSumHelper(row int, grid [][]int) Triplet {
+	if row == len(grid) {
+		return Triplet{0, 0, 0}
+	}
+
+	nextRowTriplet := minFallingPathSumHelper(row+1, grid)
+	currentTriplet := Triplet{math.MaxInt32, math.MaxInt32, -1}
+
+	for col := 0; col < len(grid[0]); col++ {
+		var value int
+		if col != nextRowTriplet.minSumIndex {
+			value = grid[row][col] + nextRowTriplet.minSum
+		} else {
+			value = grid[row][col] + nextRowTriplet.secondMinSum
+		}
+
+		if value <= currentTriplet.minSum {
+			currentTriplet.secondMinSum = currentTriplet.minSum
+			currentTriplet.minSum = value
+			currentTriplet.minSumIndex = col
+		} else if value < currentTriplet.secondMinSum {
+			currentTriplet.secondMinSum = value
+		}
+	}
+
+	return currentTriplet
+}