Given an $n\times n$ sized grid of dots $\forall n>2$, find the minimal value of segments needed to draw through all points, not holding off the hand.
118007
Not lifting your pen on the $n\times n$ grid
1802
Puzzle: Find largest rectangle (maximal rectangle problem)
152236
What is the optimal path between $2$ fixed points around an invisible obstructing wall?
51349
Minimal cut edges number in connected Eulerian graph.
16294
Drawing minimal xy axis
90184
Partition of circumference into $3k$ arcs
85541
What is the maximum length of a circuit in the complete graph on n vertices.
137578
Find the minima and maxima of a list
57867
"Planar" graphs on Möbius strips
45775
In a $\triangle ABC,$ Evaluation of minimum value of $\cot^2 A+\cot^2 B+\cot^2 C$
101912
Finding minimum bounding extent of given pixel value within raster?
70761
Number of ways to connect sets of $k$ dots in a perfect $n$-gon
117821
Compute the minimum of a pair of vectors
136918
How to determine the smallest numbers with $n$ factors
15523
Graphically approximating the area under a curve as a sum of rectangular regions
131314
Finding maximum and minimum with CUBLAS
158202
Minimum dimension to hold $N$ points with given distances?