# 17.02.2026
[401. Binary Watch](https://leetcode.com/problems/binary-watch/description) easy

All times with count bits set #easy #brainteaser

# 18.02.2026
[693. Binary Number with Alternating Bits](https://leetcode.com/problems/binary-number-with-alternating-bits/description) easy

Alternating bits #easy #bits

# 19.02.2026
[696. Count Binary Substrings](https://leetcode.com/problems/count-binary-substrings/description) easy

Count substrings of *01* and *10* #easy #sliding_window

# 21.02.2026
[762. Prime Number of Set Bits in Binary Representation](https://leetcode.com/problems/prime-number-of-set-bits-in-binary-representation/description) easy

Number in l..r with prime bits count #easy #combinatorics

# 22.02.2026
[868. Binary Gap](https://leetcode.com/problems/binary-gap/description/) easy

Distance between onces in a binary #easy

# 24.02.2026
[1022. Sum of Root To Leaf Binary Numbers](https://leetcode.com/problems/sum-of-root-to-leaf-binary-numbers/) easy

Sum of a binary numbers in a binary tree #easy

# 25.02.2026
[1356. Sort Integers by The Number of 1 Bits](https://leetcode.com/problems/sort-integers-by-the-number-of-1-bits/description) easy

Sort #easy

# 04.08.2026
[1582. Special Positions in a Binary Matrix](https://leetcode.com/problems/special-positions-in-a-binary-matrix/description/) easy

Count single 1-row-column #easy

# 05.03.2026
[1758. Minimum Changes To Make Alternating Binary String](https://leetcode.com/problems/minimum-changes-to-make-alternating-binary-string/description/) easy

Min flips to make bits alterating #easy

# 06.03.2026
[1784. Check if Binary String Has at Most One Segment of Ones](https://leetcode.com/problems/check-if-binary-string-has-at-most-one-segment-of-ones/description) easy

1+0* pattern #easy

# 21.03.2026
[3643. Flip Square Submatrix Vertically](https://leetcode.com/problems/flip-square-submatrix-vertically/descriptio) medium

Reverse submatrix k by k #easy

# 22.03.2026
[1886. Determine Whether Matrix Can Be Obtained By Rotation](https://leetcode.com/problems/determine-whether-matrix-can-be-obtained-by-rotation/solutions/7680192/kotlin-rust-by-samoylenkodmitry-bnas/) easy

Rotate matrix #easy

# 27.03.2026
[2946. Matrix Similarity After Cyclic Shifts](https://open.substack.com/pub/dmitriisamoilenko/p/27032026-2946-matrix-similarity-after?r=2bam17&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true) easy

Shift rows k times left and right #easy #matrxi

# 29.03.2026
[2839. Check if Strings Can be Made Equal With Operations I](https://open.substack.com/pub/dmitriisamoilenko/p/29032026-2839-check-if-strings-can?r=2bam17&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true) easy

Match a and b at (0|2,1|3) positions #easy

# 05.04.2026
[657. Robot Return to Origin](https://open.substack.com/pub/dmitriisamoilenko/p/05042026-657-robot-return-to-origin?r=2bam17&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true) easy

R,L,U,D return to 0 in XY plane #easy

# 10.04.2026
[3740. Minimum Distance Between Three Equal Elements I]() easy

Min sum of distances between i,j,k of the same values #easy

# 13.04.2026
[1848. Minimum Distance to the Target Element](https://leetcode.com/problems/minimum-distance-to-the-target-element/solutions/7887798/kotlin-rust-by-samoylenkodmitry-hb66/) easy

Distance to target from start #easy

# 15.04.2026
[2515. Shortest Distance to Target String in a Circular Array](https://leetcode.com/problems/shortest-distance-to-target-string-in-a-circular-array/solutions/7916324/kotlin-rust-by-samoylenkodmitry-9lqk/) easy

Distance to target #easy

# 18.04.2026
[3783. Mirror Distance of an Integer](https://leetcode.com/problems/mirror-distance-of-an-integer/solutions/7976571/kotlin-rust-by-samoylenkodmitry-nu3r/) easy

Diff with reversal #easy

# 20.04.2026
[2078. Two Furthest Houses With Different Colors](https://leetcode.com/problems/two-furthest-houses-with-different-colors/solutions/8002008/kotlin-rust-by-samoylenkodmitry-b2qs/) easy

Max distance between different numbers #easy