Pyramid Transition Matrix 🔥 | LeetCode 756 | Backtracking + HashMap | Optimal Explanation

In this video, we solve LeetCode 756 — Pyramid Transition Matrix using backtracking with hashing.

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Telegram Discussion Group link:
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Code:
https://leetcode.com/problems/pyramid-transition-matrix/solutions/7447120/backtracking-intuition-in-detail-beginne-vrxh

Upsolve Leetcode Contest:
https://youtube.com/playlist?list=PLsLlEdtakGoxoGbAwVRSlRjuB1yv1ycnc&si=_IDShX4wq0BxIkNf

Greedy & Heaps:
https://youtube.com/playlist?list=PLsLlEdtakGozAWFrLtFyKfzHL69QMdpkK&si=05iZsUB_hCmYZGPN

Two pointers:
https://youtube.com/playlist?list=PLsLlEdtakGow7Brk6c1OM_Bh-Mz55V7nX&si=hwShAQg6AT_VlwOm

Sliding Window:
https://youtube.com/playlist?list=PLsLlEdtakGozlKx_L-5PQJO-ua_maQb6R&si=hNoGQVZUI7OR9poU

Maths & Geometry:
https://youtube.com/playlist?list=PLsLlEdtakGoyWTBlOMC_mQ8Pv1M_pY2MX&si=MHwHo53uuirf26zC

Stack:
https://youtube.com/playlist?list=PLsLlEdtakGowhIcIi8uvWRy7Zw-bKoD85&si=9jvT_g2NQHFUHAMg

Set & Map:
https://youtube.com/playlist?list=PLsLlEdtakGozffR58V-u_qpYkwkR2Nc_F&si=_h2GBLEVi-hQyvI-

Bit manipulation:
https://youtube.com/playlist?list=PLsLlEdtakGowS_aAEQDNtNJA9zWkyk5uf&si=f0yO3hkGsorAhiod

Backtracking:
https://youtube.com/playlist?list=PLsLlEdtakGox7HMCBg3_sh8TrZoKnTPep&si=CMvDSFGzMRg6io1Y

Linked List:
https://youtube.com/playlist?list=PLsLlEdtakGowLdcT3ocFdt5MCEuTYVOzF&si=16QNR2HY_bLvVw2n

Binary Search:
https://youtube.com/playlist?list=PLsLlEdtakGozNxx5rfRgEW-1DYseLnDbV&si=RZ1BUYmSAvIvi5a5

Graph:
https://youtube.com/playlist?list=PLsLlEdtakGox1mdnH0PrJUhHJByUstkvx&si=JW-6qPw7zXDH-29j

Dynamic Progamming:
https://youtube.com/playlist?list=PLsLlEdtakGoyNROP7uWS9OLLHs9_JluVM&si=vJY6SxVXIHAbgzgk

You are given a bottom row of blocks and a list of allowed transitions.

Each transition maps two adjacent blocks to a block above them.

The goal is to check whether we can build the pyramid up to a single block following these rules.

🔗 Problem Link:
https://leetcode.com/problems/pyramid-transition-matrix/

Approach
Store all allowed transitions in a HashMap.

Use backtracking to build the next level of the pyramid.

Try all valid combinations recursively.

If at any point no valid block can be placed, backtrack.

Time Complexity: Exponential (backtracking)
Space Complexity: O(N) recursion depth

#leetcode #leetcode756 #backtracking #recursion #hashmap #pyramidmatrix #java #dsa #interviewprep #dailycodingchallenge #competitiveprogramming #codinglife #studyplacement

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