add new solutions

solutions/13/q1351/solution.go

@@ -0,0 +1,17 @@
+package q1351
+
+func countNegatives(grid [][]int) int {
+	w := len(grid[0])
+	count := 0
+
+	countRow := 0
+	for r := range grid {
+		for countRow < w && (grid[r][w-countRow-1] < 0) {
+			countRow++
+		}
+		count += countRow
+	}
+	return count
+}
+
+var _ = countNegatives